Map Based Jackknifes

To confirm data is uncontaminated (after field diff) split into approx equal subsets which should contain identical sky signal but different false signal:
"Deck jack" - different azimuth range (different ground) with los rotation of 60 degrees.
"Scan jack" - forward versus backwards scans
"Season jack" - first/second halves of run
"Focal plane jack" - bolo pair orientation groups
("Frequency jack" - 100 and 150GHz)

Make maps using each half of data
Subtract the maps and proceed with power spectrum analysis as usual.