IRS Mapping Schemes

LL radial strips: aligned (nominally) with major axis: 4–16x11, both slits at once; 76.4 hours.
SL nuclear and extra-nuclear: 1x9, SL1 & SL2 separately; 53.5 hours.
SH & LH nuclear and extra-nuclear: 3x5, SH-only: 2-3 cycles; 144.3 hours

LL radial strips: aligned (nominally) with major axis: 4–16x11, both slits at once; 76.4 hours.