Procedure: THM_SST_ADD_SPINDATA.PRO Purpose: Adds appropriate spin model data to SST common block structure. Arguments: cashe: structure from common block Keywords: trange: Two-element time range of requested data (double) use_eclipse_corrections: Flag to specify which spin model will be used: 0 - No corrections (default) 1 - Use partial corrections 2 - Use full eclipse corrections Notes: To be called within thm_load_sst.