Observed PACS lines towards the B1 (left panel) and R2 (right panel) positions. The blue and red dots indicate the positions of B1 and R2 and the plus signs represent the pointing of each of the 25 spaxels. In the upper left corner of each figure, the line and the range of the colour scale is indicated. Beam sizes are indicated in the lower right corners and the 32′′ circular region where the line flux has been averaged is visualised with a black circle. In the left panel, part of the line emission originating in the region close to VLA 1623 (yellow square) is picked up in the nearby spaxel.