... Up: Data Pipelines . Previous: The SCUBA Data Reduction Pipeline: ORAC-DR at the JCMT . ... We relate our experiences using the ORAC data reduction pipeline for jittered images of stars and galaxies. ... Most recipes contain a steering primitive to instruct the other primitives what operations should be performed on that image or usually the group of images to which it belongs, and to classify blank-sky from target frames. ... The pipeline uses calibration indices for dark, flat, and sky frames. ...