Why are there slight differences in the output numbers between the RG and PG model versions?
The S2K PG proxy file is generated on an operational server and will have slightly different values for either the F10 or Ly-a and/or their 81-day smoothed values. This will translate to small output differences in the integrated irradiance proxies since the data on the server is continually being updated and may also be running with a different version of S2K.