Fig. 6.
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Spatial profiles from the cross-dispersion direction of the LH module of IRS (see Lebouteiller et al. 2015, for details). Black shows the model PSF from observations of several point sources. Green diamonds show the spatial profile of NGC 253 in the observations, red is a Gaussian fit with a free FWHM. From the fit, we obtained a broadening of the PSF of 6.68″.
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