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Update to CSPI Filter Package

With improved calibration, we have updated the CSPI Filter package.

Our final data release of CSPI is eminent. Along the way, we have made several improvements to the filters, most notably using an airmass of 1.2 when applying the atmospheric corrections. This more closely matches the median airmass of our photometric standard observations. Also, we have improved color terms, which will change the derived zero-points. The latest package can be downloaded from here.