Fit to the HETG MEG−1 data. Top: the observed MEG−1 data-minus-background counts are shown in black. For reference, the IACHEC model is multiplied by the ARF and is shown in green; it has been scaled by 0.1 for clarity. The red curve shows the IACHEC model when it is further folded through an RMF that approximates the spatial extension of E0102 (see text). Bottom: the data (black) and model (red) counts are rebinned to a set of ten coarse bins which are used for the 5-parameter model fits.