Hi @pjengineering,
I just want to add that you should input the precise coordinates of the base when post-processing with Emlid Studio.
If not, Emlid Studio will use the coordinates from the RINEX header. The base position in the RINEX header is the last averaged epoch coordinate, which is accurate to a few meters. It is different from the one averaged in Emlid Flow.
This could be why RTK and PPK base positions differ by up to a meter.