This dialog appears if you do one of the following:
Use the Observables in RINEX File dialog to view and select the observables of GPS satellites to be stored in the RINEX files for the wavelengths, L1 and L2. With RINEX v2.11 and RINEX 3.02, also the observables for L5 and the Galileo E5, E5a, E5b and E1 can be stored. For GLONASS satellites, all available information is written into the RINEX files.
Note - If L2 is selected, the selection also applies for L2CA observations.