Release 20150702 Summary of changes: CLOCK: An updated NuSTAR clock correction file, version 50, is available. This file is up to date through 2015-07-02, compared to 2015-06-12 in the previous version. Performance continues to be mostly good (residuals < 2 msec, ~2 sigma), though there are some residuals around discontinuities on mission days 1989 and 2003. The clock file is available from the SOC public website: http://www.srl.caltech.edu/NuSTAR_Public/NuSTAROperationSite/clockfile.php