Integrated intensity maps of selected pairs of FIR lines from FIFI-LS with the top line shown in colors, and the bottom line in white contours. The contour levels are 25%, 50%, 75%, and 95% of the corresponding line emission peak. The “+” and “×” signs show the positions of the dense cores A and B, respectively. The spaxel size in the emission map of the [O I] line at 63 μm is 6″ × 6″ (blue channel) and in the map of other lines (CO 14-13, [OI] at 145 μm, and [CII] at 157.7 μm) is 12″ × 12″ (red channel). Gray circles show the beam size for each color map.