Spatial coverage of the spectral data sets presented in this study, overlaid on the GALEX FUV image of NGC 4736. The circumnuclear ring at a radius of r ~ 40″ (0.9 kpc) stands out clearly in the GALEX image. The different regions mapped spectroscopically, and indicated here in color, are: Spitzer/IRS long-low (14–38 μm) spectra (dark blue contours), Herschel/PACS [CII] and [OI] emission line maps (green contours), Herschel/PACS [NII]122 μm, [NII]205 μm emission line maps (yellow contours), and Spitzer/IRS short-low (5–14 μm) spectra (purple contours). In this image, north is up and east is to the left, and the total size is approximately 7.3 arc minutes on a side.
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