May or may not be of concern: some functions will only work if input data is ordered in a particular way

[CesileyKing]

1. ‘generate_focal_plane_distribution’ (MMTModules.py, lines 1081-1104) assumes that detector data is ordered in the following frequency/polarization angle combinations: freq1/polX, freq1/polY, freq2/polX, freq2/polY. When I was playing with MMT, I modified this to only increment index i by 1 and read in each detector’s info one at a time, instead of 4 at a time.

2. ‘calculate_beam_matrix’ (MMTModules.py, lines 700-710) assumes that detectors located at an even index in the dictionary have polarization angles of 0 or pi/4, and detectors located at an odd index in the dictionary are pi/2 or -pi/4. When I was playing with MMT, I modified this to check the detector IDs to determine polarization angle (but this was particular to how I was labeling detectors, so one would probably want however S4 plans to standardly label detectors).