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Fig. 3


Spectral maps of atomic lines detected with the LH module: upper panels show the distribution of [FeII] lines and lower panels the morphology of [SiII] and [SI]. The contour maps in the leftmost panels are superimposed on an IRAC band-2 image. The LH and SH module spaxel size and orientation are presented at the lower right corner of each panel. The [FeII] 18 μm morphology mapped with the SH module (Fig. 1) is presented as reference in the upper left panel along with the 26 μm [FeII] line. Even thought the LH footprint covers more area than the SH one by a factor of 4, [FeII] lines show a consistent morphology. In contrast, [SiII] and [SI] follow closer the H2 emission pattern also traced by the bright ridge in the IRAC image. Contour levels are at 10–90% of the peak emission for each transition, listed in Table 1

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