IRS/SH surface brightness (10^-12 W cm^-2 sr^-1) maps of the fine-structure lines (left panels, from top to bottom) [Ne V] 14.32 μm, [Ne III] 15.55 μm, [Ne II] 12.81 μm, (right panels, from top to bottom) [S IV] 10.51 μm, [S III] 18.71 μm, and [Cl II] 14.37 μm. The peak fluxes are shown with a white pixel. These fluxes are not corrected for extinction, and each of the 9 × 9 pixels correspond to the fitted flux in the 2 × 2 aperture extracted spectrum as described in Sects. 2.3 and 3.2. The dashed-line circle represents the  ± 1′′ pointing accuracy of Spitzer, and the contour lines are labeled. The reference (Δα = 0,Δδ = 0) is marked with a cross and corresponds to the position RA (J2000) = 13:05:27.477, Dec (J2000) = –49:28:05.57 of the H₂O mega maser reported by Greenhill et al. (1997).