Map Based Jackknifes

An internal consistency check

To confirm data is uncontaminated (after field diff) split into approx. equal subsets which should contain identical sky signal, but likely different false signal:
"Deck jack" - different azimuth range (different ground) with 60 deg rotation about line-of-sight
"Scan jack" - forward versus backwards scans
"Season jack" - first/second halves of data
"Focal plane jack" - bolo pair orientation groups

Make maps using each half of data
Subtract the maps - result should just be noise...