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    <tt>This week's tip: qc: little known (but sometimes useful) options</tt>
    <div class="moz-forward-container">
      <pre>This tip covers a few qc options that have been around since the beginning of teqc,
but are little known.  All of them can have an impact on the presentation of the
data or problem indicators in the ASCII timeplot (see tip of week 2019,
<a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002534.html">https://postal.unavco.org/pipermail/teqc/2018/002534.html</a>).

For reference, let's start with a qc result without any of the options that will
be discussed below.  This happens to be a qc full of 24 hours, but where the
receiver stopped tracking SVs between hours 7 nad 8:

 SV+--------|--------|--------|--------|--------|--------|--------|--------|+ SV
  2|o+m                                         __--------------------------|  2
 26|oLL                                     _______________-----------------| 26
  5|++m__                                            __---------------------|  5
 15|oooooo++m^                                                __------------| 15
 24|oooooooooo+m                                      ___----_______--------| 24
 12|+++oooooooooo++L                                     _------------------| 12
 21|ooooooooooomIIImm_                                                 __---| 21
 25|moooomoooooooooooooL_                                     _-------------| 25
 18|ooooooooooooooooooo++                                          __-------| 18
 29|ooooooooLmmLmLLLm+++++_                                      _----------| 29
 22|L+++ooooooooooooooooooo+__                                            __| 22
 14|moooooooooooooooooooooo-----__                                         _| 14
  6|   LLLmm+m++mmm+++ooooo-------------_                                   |  6
...
   +--------|--------|--------|--------|--------|--------|--------|--------|+
00:00                                                                      00:00
2013 Oct  9                                                          2013 Oct 10

Remember you can run `teqc ++sym` to get a table of all the indicators and their meaning.

The first two qc options which affect the ASCII timeplot presentation are '-data' and '-lli':

'-data' - This qc option means "don't show data indicators in the qc ASCII timeplot",
but all problem indicators will continue to be displayed.

'-lli' -  This means "don't show loss-of-lock indicators in the qc ASCII timeplot",
i.e. don't show the 'L' indicators showing where the receiver is indicating a
loss-of-lock; see tip of week 2015, <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002524.html">https://postal.unavco.org/pipermail/teqc/2018/002524.html</a>.

Using both '-data' and '-lli' will basically reduce the ASCII timeplot down to slip
indicators and, if qc full, indicators for:
   - any orbit/point-position problems,
   - epochs with missing SV observables,
   - epochs with SV observables below the cutoff mask angle (default of 10 degrees), and
   - epochs above the horizon.

The above qc ASCII timeplot with '-data' and '-lli' is transformed into:

 SV+--------|--------|--------|--------|--------|--------|--------|--------|+ SV
 25|m    m             +_                                     _-------------| 25
 12|+++          +++                                     _------------------| 12
 29|        +mm+m+^+m+++++_                                      _----------| 29
  2| +m                                         __--------------------------|  2
 24|          +m                                      ___----_______--------| 24
 22|++++                   +__                                            __| 22
 21|           mIIImm_                                                 __---| 21
 26| +^                                     _______________-----------------| 26
 15|      ++m^                                                __------------| 15
 18|                   ++                                          __-------| 18
 14|m                      -----__                                         _| 14
  5|++m__                                            __---------------------|  5
  6|   ^^^mm+m++mmm+++     -------------_                                   |  6
...

The '+' and '^' indicators in the ASCII timeplot, of course, indicate that there are
complete or partial observables, respectively, below the 10 degree cutoff mask angle
and above the horizon angle.  (One could use the '-set_mask' option with values less
than 10 to determine the approximate masking angle in the receiver configuration by
noting at which angle the '+' and '^' indicators stop showing up.)

Next:

'-mp' - This means "don't do multipath combinations", which also means teqc won't be
looking for multipath slips, and thus multipath indicators won't be shown in the qc
ASCII timeplot; see tip of week 2017, <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002527.html">https://postal.unavco.org/pipermail/teqc/2018/002527.html</a>.
(If using '+plot' with '-mp', teqc won't create the multipath .m* compact3 plot files.)

Re-doing the qc with both '-lli' and '-mp':

 SV+--------|--------|--------|--------|--------|--------|--------|--------|+ SV
  2|o++                                         __--------------------------|  2
 26|o+^                                     _______________-----------------| 26
  5|+++__                                            __---------------------|  5
 15|oooooo+++^                                                __------------| 15
 24|oooooooooo++                                      ___----_______--------| 24
 12|+++oooooooooo+++                                     _------------------| 12
 21|ooooooooooocIII++_                                                 __---| 21
 25|ooooocooooooooooooo+_                                     _-------------| 25
 18|ooooooooooooooooooo++                                          __-------| 18
 29|oooooooo++++++^+++++++_                                      _----------| 29
 22|++++ooooooooooooooooooo+__                                            __| 22
 14|+oooooooooooooooooooooo-----__                                         _| 14
  6|   ^^^++++++++++++ooooo-------------_                                   |  6
...

Finally:

'-ion' - This means "don't do ionospheric combinations", which also means teqc won't
be looking for any slips based on pure ionospheric combination jumps.

'-iod' - This means "don't do ionospheric time-rate-of-change, which also means
teqc won't be looking for any slips based on ionospheric time-rate-of-change jumps.

These last two options depend strongly on what the jump criteria are, which have
the default values of:

        iono jump = 3.4e+38 centimeters (i.e. a really big number)

        iono/dt jump = 400 centimeters/minute

... which are good values for sample intervals greater than 1 second.  At this
point you might want to review suggestions for smaller sample intervals in tip of week
1895, <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002071.html">https://postal.unavco.org/pipermail/teqc/2016/002071.html</a>.

In any event, using both '-ion' and '-iod' effectively stop teqc from doing any
slip calculations based on ionospheric combinations or their time-rate-of-change,
and therefore ion/iod slip indicators won't be shown in the qc ASCII timeplot.
(But if using '+plot' with '-ion' and/or '-iod', teqc won't create the ionosphere
.i* and/or .d* compact3 files, respectively.)

Re-doing the qc with '-lli', '-mp', '-ion', and '-iod':

  SV+--------|--------|--------|--------|--------|--------|--------|--------|+ SV
  2|o++                                         __--------------------------|  2
 26|o+^                                     _______________-----------------| 26
  5|+++__                                            __---------------------|  5
 15|oooooo+++^                                                __------------| 15
 24|oooooooooo++                                      ___----_______--------| 24
 12|+++oooooooooo+++                                     _------------------| 12
 21|oooooooooooc---++_                                                 __---| 21
 25|ooooocooooooooooooo+_                                     _-------------| 25
 18|ooooooooooooooooooo++                                          __-------| 18
 29|oooooooo++++++^+++++++_                                      _----------| 29
 22|++++ooooooooooooooooooo+__                                            __| 22
 14|+oooooooooooooooooooooo-----__                                         _| 14
  6|   ^^^++++++++++++ooooo-------------_                                   |  6
...

There isn't an option which is the exact opposite of '-data' -- which, if it existed,
would be "don't show any problem indicators in the qc ASCII timeplot" -- but this
last example, using '-lli -mp -ion -iod' (which can be in any order), is about as
close as one can come.  Without cluttering up the qc result with data problem indicators,
this is showing where there's complete observables above the 10 degree cutoff mask,
where there's observables below the 10 degree cutoff, and where data is entirely missing.

And re-doing the qc with all of '-data', '-lli', '-mp', '-ion', and '-iod':

 SV+--------|--------|--------|--------|--------|--------|--------|--------|+ SV
 25|                   +_                                     _-------------| 25
 12|+++          +++                                     _------------------| 12
 29|        ++++++^+++++++_                                      _----------| 29
  2| ++                                         __--------------------------|  2
 24|          ++                                      ___----_______--------| 24
 22|++++                   +__                                            __| 22
 21|            ---++_                                                 __---| 21
 26| +^                                     _______________-----------------| 26
 15|      +++^                                                __------------| 15
 18|                   ++                                          __-------| 18
 14|+                      -----__                                         _| 14
  5|+++__                                            __---------------------|  5
  6|   ^^^++++++++++++     -------------_                                   |  6
...

shows when there's missing data above the cutoff mask ('-'), when there's complete or
partial data between the horizon and the the cutoff mask ('+' and '^', respectively),
and when the SV is between the horizon and the cutoff mask ('_', if there are no data).
What one can see here is that the receiver was logging observables below the cutoff angle
on all SVs -- right up until the receiver stopped tracking observables altogether.

Play around with these qc options and see what new things you can discover about your GNSS data.

Happy teqc-ing!

cheers,
--lou

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
Boulder, CO  80301-5554            e-mail:  lou  unavco.org

"If the universe is the answer, what is the question?"
                                               -- Leon Lederman
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Past helpful tips:

week 1894: using teqc config files - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002067.html">https://postal.unavco.org/pipermail/teqc/2016/002067.html</a>
week 1895: qc of high-rate data - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002071.html">https://postal.unavco.org/pipermail/teqc/2016/002071.html</a>
week 1896: UNIX/Linux shells for Windows - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002072.html">https://postal.unavco.org/pipermail/teqc/2016/002072.html</a>
week 1897: '-' vs. '+' teqc options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002076.html">https://postal.unavco.org/pipermail/teqc/2016/002076.html</a>
week 1898: auto-identification of formats - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002092.html">https://postal.unavco.org/pipermail/teqc/2016/002092.html</a>
week 1899: auto-identification vs. format flags - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002096.html">https://postal.unavco.org/pipermail/teqc/2016/002096.html</a>
week 1900: square brackets in options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002105.html">https://postal.unavco.org/pipermail/teqc/2016/002105.html</a>
week 1901: using option '+mds' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002108.html">https://postal.unavco.org/pipermail/teqc/2016/002108.html</a>
week 1902: qc results w/ problematic nav messages - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002113.html">https://postal.unavco.org/pipermail/teqc/2016/002113.html</a>
week 1903: '-no_orb[it]' and '-no_pos[ition]' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002115.html">https://postal.unavco.org/pipermail/teqc/2016/002115.html</a>
week 1904: '-week' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002117.html">https://postal.unavco.org/pipermail/teqc/2016/002117.html</a>
week 1905: using '+bcf' for XYZ/geodetic conversion - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002126.html">https://postal.unavco.org/pipermail/teqc/2016/002126.html</a>
week 1906: the '+v[erify]' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002128.html">https://postal.unavco.org/pipermail/teqc/2016/002128.html</a>
week 1907: '+C2', '+L5', "+L6', '+L7', '+L8', '+all' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002130.html">https://postal.unavco.org/pipermail/teqc/2016/002130.html</a>
week 1908: getting RINEX doppler and L2 - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002131.html">https://postal.unavco.org/pipermail/teqc/2016/002131.html</a>
week 1909: using paths w/ file names - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002132.html">https://postal.unavco.org/pipermail/teqc/2016/002132.html</a>
week 1910: the (un)importance of file names - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002133.html">https://postal.unavco.org/pipermail/teqc/2016/002133.html</a>
week 1911: notices, warnings, and errors - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002134.html">https://postal.unavco.org/pipermail/teqc/2016/002134.html</a>
week 1912: the '-max_rx_SVs' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002137.html">https://postal.unavco.org/pipermail/teqc/2016/002137.html</a>
week 1913: the end of '++igs' and '+igs' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002140.html">https://postal.unavco.org/pipermail/teqc/2016/002140.html</a>
week 1914: splicing together RINEX files - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002144.html">https://postal.unavco.org/pipermail/teqc/2016/002144.html</a>
week 1915: using '-O.int' and '-O.dec' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002145.html">https://postal.unavco.org/pipermail/teqc/2016/002145.html</a>
week 1916: '+doy' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002146.html">https://postal.unavco.org/pipermail/teqc/2016/002146.html</a>
week 1917: '-tbin' and '-ast' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002152.html">https://postal.unavco.org/pipermail/teqc/2016/002152.html</a>
week 1918: mp12 RMS before/after Oct 2013 - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002158.html">https://postal.unavco.org/pipermail/teqc/2016/002158.html</a>
week 1919: the global windowing options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002159.html">https://postal.unavco.org/pipermail/teqc/2016/002159.html</a>
week 1920: '-M.dec' and '-N.dec' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002163.html">https://postal.unavco.org/pipermail/teqc/2016/002163.html</a>
week 1921: combining time filtering options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002176.html">https://postal.unavco.org/pipermail/teqc/2016/002176.html</a>
week 1922: helping me (or someone else on the list) help you - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002187.html">https://postal.unavco.org/pipermail/teqc/2016/002187.html</a>
week 1923: the "build" line - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002190.html">https://postal.unavco.org/pipermail/teqc/2016/002190.html</a>
week 1924: the qc '-w[idth]' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002193.html">https://postal.unavco.org/pipermail/teqc/2016/002193.html</a>
week 1925: qc with explicit time windowing - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002194.html">https://postal.unavco.org/pipermail/teqc/2016/002194.html</a>
week 1926: the '+rx_state' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002200.html">https://postal.unavco.org/pipermail/teqc/2016/002200.html</a>
week 1927: the '-O.sum' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002204.html">https://postal.unavco.org/pipermail/teqc/2016/002204.html</a>
week 1928: the '+meta' and '+mds' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2016/002206.html">https://postal.unavco.org/pipermail/teqc/2016/002206.html</a>
week 1930: more on '-O.sum' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002207.html">https://postal.unavco.org/pipermail/teqc/2017/002207.html</a>
week 1931: the '-O.s[ystem]' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002208.html">https://postal.unavco.org/pipermail/teqc/2017/002208.html</a>
week 1932: leap seconds - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002215.html">https://postal.unavco.org/pipermail/teqc/2017/002215.html</a>
week 1936: what you can (and shouldn't) do in a RINEX obs file - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002229.html">https://postal.unavco.org/pipermail/teqc/2017/002229.html</a>
week 1938: the '+psp' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002231.html">https://postal.unavco.org/pipermail/teqc/2017/002231.html</a>
week 1939: the '+diag' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002235.html">https://postal.unavco.org/pipermail/teqc/2017/002235.html</a>
week 1951: '-n_<system>' and SV filtering options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002277.html">https://postal.unavco.org/pipermail/teqc/2017/002277.html</a>
week 1953: more with '+diag' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002287.html">https://postal.unavco.org/pipermail/teqc/2017/002287.html</a>
week 1954: using '+diag' output to split raw files - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002290.html">https://postal.unavco.org/pipermail/teqc/2017/002290.html</a>
week 1955: current qc notation - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002302.html">https://postal.unavco.org/pipermail/teqc/2017/002302.html</a>
week 1956: the '+qcq' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002304.html">https://postal.unavco.org/pipermail/teqc/2017/002304.html</a>
week 1957: using Trimble formats - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002305.html">https://postal.unavco.org/pipermail/teqc/2017/002305.html</a>
week 1958: ToC != ToE messages - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002310.html">https://postal.unavco.org/pipermail/teqc/2017/002310.html</a>
week 1959: receivers vs. formats - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002311.html">https://postal.unavco.org/pipermail/teqc/2017/002311.html</a>
week 1960: when the '-week' option is very wrong to use - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002314.html">https://postal.unavco.org/pipermail/teqc/2017/002314.html</a>
week 1961: "less" is usually best - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002315.html">https://postal.unavco.org/pipermail/teqc/2017/002315.html</a>
week 1962: using GPS L2C with teqc - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002316.html">https://postal.unavco.org/pipermail/teqc/2017/002316.html</a>
week 1964: the '+eds' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002317.html">https://postal.unavco.org/pipermail/teqc/2017/002317.html</a>
week 1965: handling RINEX comment lines - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002324.html">https://postal.unavco.org/pipermail/teqc/2017/002324.html</a>
week 1966: the '+dUTC_p' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002331.html">https://postal.unavco.org/pipermail/teqc/2017/002331.html</a>
week 1967: the strange position from '+meta' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002355.html">https://postal.unavco.org/pipermail/teqc/2017/002355.html</a>
week 1972: what shows up as metadata in RINEX headers - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002362.html">https://postal.unavco.org/pipermail/teqc/2017/002362.html</a>
week 1973: GPS L2C navigation messages - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002363.html">https://postal.unavco.org/pipermail/teqc/2017/002363.html</a>
week 1974: the '+ion_p' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002370.html">https://postal.unavco.org/pipermail/teqc/2017/002370.html</a>
week 1975: the '+event' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002372.html">https://postal.unavco.org/pipermail/teqc/2017/002372.html</a>
week 1976: options '+smtt' (default) vs. '-smtt' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002374.html">https://postal.unavco.org/pipermail/teqc/2017/002374.html</a>
week 1977: the reported interval with '+meta' for a RINEX obs file - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002377.html">https://postal.unavco.org/pipermail/teqc/2017/002377.html</a>
week 1978: the '-N.dUTC' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002378.html">https://postal.unavco.org/pipermail/teqc/2017/002378.html</a>
week 1979: the various qc elevation angles - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002383.html">https://postal.unavco.org/pipermail/teqc/2017/002383.html</a>
week 1980: avoid in RINEX: Transit data - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002385.html">https://postal.unavco.org/pipermail/teqc/2017/002385.html</a>
week 1981: avoid in RINEX: epoch flag = 6 - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2017/002389.html">https://postal.unavco.org/pipermail/teqc/2017/002389.html</a>
week 1982: avoid in RINEX: RCV CLOCK OFFS APPL = 1 - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002392.html">https://postal.unavco.org/pipermail/teqc/2018/002392.html</a>
week 1983: don't count on in RINEX: receiver clock offset per epoch - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002393.html">https://postal.unavco.org/pipermail/teqc/2018/002393.html</a>
week 1984: requirements for multiple target files/stdin - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002410.html">https://postal.unavco.org/pipermail/teqc/2018/002410.html</a>
week 1985: default output for various input - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002412.html">https://postal.unavco.org/pipermail/teqc/2018/002412.html</a>
week 1986: the '+latency' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002419.html">https://postal.unavco.org/pipermail/teqc/2018/002419.html</a>
week 1987: the 'O.px and 'O.pg' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002422.html">https://postal.unavco.org/pipermail/teqc/2018/002422.html</a>
week 1988: the '+relax' option - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002423.html">https://postal.unavco.org/pipermail/teqc/2018/002423.html</a>
week 1992: the '+x_tilt' options - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002452.html">https://postal.unavco.org/pipermail/teqc/2018/002452.html</a>
week 1993: GLONASS: slot and freq. chnl. numbers - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002453.html">https://postal.unavco.org/pipermail/teqc/2018/002453.html</a>
week 1994: GLONASS: slot numbers > 24 - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002454.html">https://postal.unavco.org/pipermail/teqc/2018/002454.html</a>
week 1995: GLONASS: signals - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002456.html">https://postal.unavco.org/pipermail/teqc/2018/002456.html</a>
week 1996: GLONASS: broadcast ephemeris - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002457.html">https://postal.unavco.org/pipermail/teqc/2018/002457.html</a>
week 1997: GLONASS: system time and broadcast time parameters - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002458.html">https://postal.unavco.org/pipermail/teqc/2018/002458.html</a>
week 1998: qc: 'lite' vs. 'full' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002470.html">https://postal.unavco.org/pipermail/teqc/2018/002470.html</a>
week 1999: qc: the 'full' point-position and the antenna 'height' - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002474.html">https://postal.unavco.org/pipermail/teqc/2018/002474.html</a>
week 2000: qc: what's a "complete observation"? - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002475.html">https://postal.unavco.org/pipermail/teqc/2018/002475.html</a>
week 2001: qc: percentage of actual to expected complete observations - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002483.html">https://postal.unavco.org/pipermail/teqc/2018/002483.html</a>
week 2014: qc: interpreting slips - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002521.html">https://postal.unavco.org/pipermail/teqc/2018/002521.html</a>
week 2015: qc: loss-of-lock - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002524.html">https://postal.unavco.org/pipermail/teqc/2018/002524.html</a>
week 2016: qc: observations per slip - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002526.html">https://postal.unavco.org/pipermail/teqc/2018/002526.html</a>
week 2017: qc: multipath rms - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002527.html">https://postal.unavco.org/pipermail/teqc/2018/002527.html</a>
week 2018: qc: signal-to-noise - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002532.html">https://postal.unavco.org/pipermail/teqc/2018/002532.html</a>
week 2019: qc: the ASCII time plot - <a class="moz-txt-link-freetext" href="https://postal.unavco.org/pipermail/teqc/2018/002534.html">https://postal.unavco.org/pipermail/teqc/2018/002534.html</a>

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