The SRCLIST table, as created by rgssources, is a required input, and is not modified. The PRIMESRC attribute and the following columns are accessed.
| INDEX | int32 | source identifier |
| RGS_DISP RGS_XDSP | real32 | RGS offaxis angles (arcmin) |
| SRC_SELECT | int8 | flag for standard processing |
| BACK_SELECT | int8 | flag for background exclusion |
The EVENTS table, as last modified by rgsangles, is a required input, and is not modified. Columns BETA_CHANNEL, MLAMBDA_CHANNEL and XDSP_CHANNEL are accessed for the following attributes: TCDLT, TCRVL, TCRPX, TLMIN and TLMAX.
A set of node-specific exposure map extensions, as created by evlistcomb, is a required input. These are not modified. The array dimensions and the attributes, CCDID, CCDNODE, CDELT1, CRVAL1, CRPIX1, CDELT2, CRVAL2, CRPIX2 are accessed.