Data/model ratios for a variety of the continuum models applied to the full broadband X-ray spectrum of Holmberg IX X-1 obtained during epoch 2 (see Section 3.2). XMM-Newton EPIC-pn and EPIC-MOS data are shown in black and red, respectively, and NuSTAR FPMA and FPMB in green and blue; the data have been rebinned for visual clarity.