[teqc] effect of Everest multipath reduction on GPS time series ?

[Charles DeMets]

  Does anyone know whether Trimbles that have employed Everest multipath 
reduction for continuous recording give rise to coordinate time series 
that are any different than if the multipath reduction had NOT been used 
?   Is it conceivable that multipath reduction could give rise to time 
series artifacts that might change the apparent motion for one or more 
components of the station position or would it just tend to affect the 
daily random noise in estimated station coordinates without changing the 
apparent long-term slope ?

  Thanks, Chuck DeMets