EPIC-pn spectra for the two sets of three observations of Holmberg IX X-1, the first taken in October (left panel; associated with NuSTAR observation 1) and the second in November (right panel; associated with NuSTAR observation 2). The black, red, and green spectra show the first, second, and third observations from each set of three. Although there is some mild flux variability displayed by the observations in each set, it is clear there is very little spectral variability.