This utility option should be run immediately after ech_spatial/ECHMENU Option 4 has been used to define the dekker and object limits.
It uses information about the order paths and the spatial profile in order to do a more effective cosmic-ray location. The sky and object pixels are processed separately in two passes.
Each order in turn is processed by evaluating the degree to which its pixels exceed their expected intensities (based upon profile and total intensity in the increment).
A cumulative distribution function is then constructed and clipped at a pre-determined sigma level. Clipping and re-fitting continues until a Kolmogorov-Smirnov test indicates convergence or until the number of clipped points falls to one per iteration. Located cosmic-ray pixels are flagged in the quality array. Both this and the pre-trace-locator are automatically followed by a routine to do sky-line checking. This routine can restore any pixels it judges to be possible sky line pixels (rather than cosmic-ray hits). If there are many frames of the same object available then it is possible to use coincidence checking to enhance cosmic-ray detection. The script decos_many will take list of input frames and perform this checking, and flags the cosmic-ray pixels in each frame. To use it type:
Reduction File Objects: