Observing Redundancies

Split each 1 hour period between lead and trail fields (7.5deg apart in RA) repeating exact same scan pattern with respect to the ground
Field difference to cancel ground pickup
Each day during the two 8 hour periods repeat exactly the same scan pattern on sky with telescope rotated by 60 deg around line of sight (over different ground)
Powerful "Deck Jackknife"
Each day cover a strip 0.64 deg high in el, repeat passes offset and interleaved.

Observed 10x6 deg patch (partially) overlapping B03 deep field region for 300+ days