The ten submatrices are:
0 -Grid-pair transmission
1 - Attenuator transmission
2 - Blanket transmission
3 - Det. resp. to modulated photons
4 - Det. resp. to scattering in 2nd grid and attenuator
5 - Det. resp. to spacecraft scatter
6 - Det. resp. to Earth scattering
7 - Detector resolution (w/ radiation damage)
8 - Extra broadening (no longer in use)
9 - Detector LLD threshold cutoff
The value in each element is 0,1,2, or 3 and means
0 - Full calculation of diagonal, off diagonal terms
1 - Off diagonal terms are an approximation - for most submatrices this will mean an average of all segments of the right kind (f,r,coinc.) instead of detector-specific results
2 - Diagonal terms only
3 - Diagonal terms only, and all = 1 (or zero if it is a normally off-diagonal matrix)