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The calibration constants structure will be different for different detectors, but typically contains items such as per-pixel pedestals, gains, and x-y-z coordinates.  Our current thinking is to keep this area-detector interface small, but we are considering providing helper objects that would be generally useful for users.  A possible example would be the get_psf() that Mikhail implemented at the request of Rick Kirian that returns position vectors in the slow/fast readout directions.  Perhaps the psf values could be additional entries placed into the det.calibconst dictionary by the detector interface code?