Spectra of the ¹²CO(3−2), ¹³CO(3−2), and C¹⁸O(3−2) lines indicated in black, red, and blue, respectively. Each spectrum is the average of the profiles within a field of 25.̋5 × 25.̋5. The total area is 150′′× 150′′ for three molecules. The locations of sources 1 (S1) and 3 (S3) are labeled. In each panel the velocity ranges from −4 to +15 km s^-1 and T_mb scales from −2 to 18 K.