Observed (upper panel) and modeled (lower panel) C¹⁸O (1−0) (blue), ¹³CO (red), and ¹²CO (1−0) (black) line emission the B213-L1495 region (positions 1 to 4). The location of these spectra are indicated in the map in Fig. 7. The total visual extinction of gas at these positions, derived from Herschel continuum observations, are indicated in the upper right corner. Multiple peaks are identified in the ¹³CO and ¹²CO spectra when these lines become optically thin (e.g., position 3). Symbols and lines as in Fig. 6.