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STIS Instrument Handbook for Cycle 24 |
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Engineering MODE MODE=ACQ or ACQ/PEAK Data events are tabulated in rootname_tag.fits file with one binary table extension for each buffer read (determined by exposure time and BUFFER-TIME parameters). All raw data events are gathered into a single image, rootname_raw.fits, which is then passed through the normal calibration steps. The number of imsets in the raw file equals CR-SPLIT or Number_of_Iterations. Raw file imsets are cosmic ray rejected and summed before the bias, dark, and flat-fielding corrections are made, producing a rootname_crj.fits file. The individual imsets are also flagged for cosmic rays and processed without summing to produce a rootname_flt.fits file. The raw file contains Number_of_Iterations imsets, as do the flat-fielded and 2-D rectified files; the 1-D extracted files contain Number_of_Iterations tables. Repeat exposure imsets are summed after flat-fielding and 2-D rectification producing files rootname_sfl.fits and rootname_x2d.fits respectively (this is also true for imaging data). Note that for the MAMA detectors, 1-D spectral extraction data are not summed even when there are repeat exposures. Separate PATTERN step exposures are not associated with each other. Each PATTERN step exposure is processed through calibration independently.