pId :: Array containing which positioners are in the structure data. Range is from 1 - 2400. Take (moduleID-1)*57+posID
activeCobras :: Which of the positioners in pId array are moving in the data. The rest are assumed to be at home position and never moved during the test.
centers :: array containing stage 1 centers as imaginary numbers. Ordering must correspond with pId array
refpos :: array containing the permanent fiducial locations as complex numbers relative to their common origin defined as the mean of their positions in CCD frame. This must always be in the same order.
pId<1-2400> :: Data structure of specific positioner with ID between 1 and 2400 as defined in the pId array