Unfolded pn (blue), MOS1 (red), and MO2 (green) spectra fitted with an absorbed dual thermal component (tbabs⊗tbabs⊗ (diskbb + diskbb)) on (left) observation 0200470101 of Holmberg II X-1 ( ∼ 1.34) and (right) observations 0723130301 and 0723130401 of NGC 5408 X-1 ( ∼ 1.5), which we fit together given the lack of variability (see Sect. 3). Data have been visually rebinned to have at least 3σ significance and a minimum of 35 counts per bin. Some clear residuals are seen at high energies indicating that the model is inadequate.