Maria João wrote: > I’ve noticed that in some .ion and .iod files TEQC places an I after > some values, as in the second line of data > > 9 5 14 18 26 30 34 53 54 55 > > 0.044 0.055 -0.174 -0.249 0.032 0.022I 0.089 0.052 0.569 > > Does it mean anything or is it a bug? The "I" means there was an ionospheric slip detected for that SV at that epoch. --lou