ACIS-S spectrum of the G3-G5 system, fit with a single-temperature APEC model. On the left, the spectrum of the full G3-G5 group is shown (1 arcmin aperture), while on the right an annulus excluding the G3 and G4 galaxies has been used. The bottom panels show the residuals from the fit. In both cases, the background level is shown in blue.
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