Morphology of different lines: a) CH⁺J = 3–2; b) CH⁺J = 1–0; c) OH 84.6 μm; and d) OH 119.4 μm. Contours with contour steps of 20% of the peak emission in the Bar. The intensities are in units of erg s^-1 cm^-2 sr^-1. The black pixels are pixels where lines are not detected. The beam sizes (6″ for OH 84 μm, 9″ for CH⁺J = 3–2 and OH 119 μm, and 19″ for CH⁺J = 1–0) are shown in the bottom left corner. The positions from which the spectra in Fig. 2 are also indicated in the pictures with corresponding numbers.