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Level-3 (L3): data calibrated in physical units (MSB= Mean Solar Brightness) representing the solar K-corona. Background signals (F-corona, instrumental stray light) are removed via the subtraction of a "background" model (L2b FITS files available here. L3 data are available only for synoptic observations. Please add the proper acknowledgment when using these data. For further assistance, please contact the WISPR team.