UX Ari is a bright RS CVn binary system - a prototypical coronal source. Simulations were run for both HETG and LETG with the same input spectrum to an equivalent exposure time of about 40 ks. The central part of the figure shows a detected photon intensity image in proper aspect on the 6-CCD detector array. A zoom on the zero-order region is shown above the image.
Colored points are first order photons.
Whitepoints are higher order photons, which can in principle be distinguished based on their pulse-height. Simulations will directly determine how good order-sorting is. Simulated data are used to develop software for extraction of one-dimensional spectra. Figure 3 . This is an expanded view of the MEG first-order counts spectrum in the vicinity of some lines.