The fringe step applies a fringe correction to MIRI MRS images. In particular, the SCI array from a fringe reference file is divided into the SCI and ERR arrays of the science data set. Only pixels that have valid (non-NaN) values in the SCI array of the reference file will be corrected. The DQ and variance arrays of the science exposure are not currently modified by this step.

The input to this step is in the form of an ImageModel data model. The fringe reference file that matches the input detector (MIRIFUSHORT or MIRIFULONG) and wavelength band (SHORT, MEDIUM, or LONG, as specified by GRATNG14) is used.

Upon successful application of this correction, the status keyword “S_FRINGE” is set to “COMPLETE”.