&stochy_nam namelist variables lon_s, lat_s, ntrunc

What are the lon_s, lat_s, ntrunc variables in the &stochy_nam namelist?  Should these variables be at the same resolution as your input gaussian grid, your output gaussian grid, or are they independent of this?

Here are the explanations for those variables in the &stochy_nam namelist:

https://stochastic-physics.readthedocs.io/en/ufs-v1.0.0/namelist_options.html