NuSTAR CALDB Release Version: 20131223 Release Type: CALDB patch. Pre-requisite: NuSTAR CALDB Release 20131007 The CALDB patch contains the following files: fpm/caldb.indx fpm/index/caldb.indx20131223 fpm/bcf/vign/nuAvign20100101v006.fits fpm/bcf/vign/nuBvign20100101v006.fits Summary of changes: VIGN: The NuSTAR vignetting files have been adjusted to improve the fidelity of the response files near absorption edges caused by W (at 69.5 keV) in the X-ray optics. The response files are now valid up to 78 keV, where absorption due to Pt (nominally at 78.4 keV) dominates the response of the optics. It is recommended that users restrict fitting ranges to below 78 keV, if possible, to prevent known systematic errors in the ARF from contributing to continuum fits.