MIRI MRS Performance
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Due to the nature of an IFU spectrograph with its slicing and dispersing optics, the resulting detector images are not straight-forward to analyze: Spatial, spectral, and with it photometric information, are spread over the entire detector array. Further, the gratings are used in an optically fast, non-Littrow configu- ration. The resulting anamorphic magnification varies from the short to long wavelength limit for each sub-band which, when combined with the curved spectral images of the dispersed sli- ces on the detector as shown in Figure 11, makes the optical distortion significant and complex. The anamorphic and slicing optics add other components of distortion that vary the plate scale in the along-slice direction for each slice individually. This leads to a very complicated variation of the spatial plate scales and finally to a dependency of the spatial and spectral axes on each other and on the location on the detector array.