sim_a2d_index_mask

sim_a2d_index_mask is a 27 element byte array that controls which detector / segment data is used in the simulation. Set to 1 to use the detector / segment. The first 9 elements refer to the front segments of detectors 1-9, the next 9 elements of the array refer to the low energy portion of the rear segments of detectors 1-9, and the last 9 elements refer to the high energy portion of the rear segments for detectors 1-9.