This .zip file contains pictures obtained by shining light through an optical fiber over the dorsal aspect of the dorsal raphe nucleus (in freshly dissected brain tissue, see the paper for a detailed description of the procedure). The archive contains pictures from 3 different brains. For each brain, the same field of view was imaged using brightfield illumination (file names ending with "_TL") in order to show the contours of the DRN, and under illumination through the optical fiber (file names ending with "_OF_ILLUMINATION"). The format is 12 bits encoding. These pictures were used to generate Fig. 2B, C and D
