Spectra of F05189–2524 (top left), Mrk 273 (top right), PKS 1345+12 (bottom left) and Arp 220 (bottom right) with their respective best-fit models for all four XIS detectors. F08572 + 3915 is not detected by the XIS. The data are binned to at least 50 counts/bin for PKS 1345+12 and at least 15 counts/bin for the others. The horizontal axis is energy in the observer's frame. In F05189–2524, Mrk 273, and Arp 220, an emission line is detected near 6.4–6.7 keV, consistent with emission arising from neutral or ionized iron. The same emission line also appears to be present in PKS 1345+12, but the detection is not statistically significant (Δχ ² = 2.0 for Δdof=2). Other than PKS 1345+12, the 0.5–2 keV spectrum for each object has a thermal component with temperatures of ~0.7–0.8 keV, consistent with earlier results on ULIRGs. The best-fit parameters are listed in Table 3.