Represents the RTML Correction element (child of Request).
If the RTML is for ACP Scheduler, then if any of the corrections Dark, Dome, Flat, Fringe, or Zero are true, a full image calibration will be performed using the image processing system (MaxIm DL, etc.). Only the FixPix correction is separate, and if true will cause a hot-pixel removal to be performed, and only if any of the other corrections are specified. In other words, FixPix by itself will not do anything.