Absolutely simultaneous NuSTAR (black for FPMA, red for FPMB) and XMM-Newton (green) spectra from the long dim state observed on MJD 58174, showcasing the necessity of including both a DSH correction, and an energy calibration correction when fitting these X-ray spectra. Only when both corrections are applied do the spectra agree reasonably well. (a) Spectra without a DSH, and without an energy scale correction. (b) Spectra with a DSH, but without an energy scale correction. (c) Spectra with both a DSH, and an energy scale correction.