Sky-subtracted surface brightness for B207 in U, B, V, R, I, WISE1-3.4 μm, and SPIRE-350 μm bands. The intensities in optical, 3.4 μm, and 350 μm are in erg/cm²/s/A/sr, kJy/sr, and MJy/sr, respectively. The east-west direction is marked in the U-band plot starting from east (left) to west (right). The position of the eastern bright rim, core, protostar IRAS 04016+2610, and the transparent hole region are marked as R, C, S, and H, respectively. The east-west distance is measured from the centre of the box close to the protostar, where the zero position corresponds to RA = 4^h4^m43.5^s, Dec = + 26°18′50″.