CO rotational diagrams toward core A (left, in blue) and B (right, in orange). Circles refer to values based on line detections and the triangle shows the measurement using the upper limit of the CO 31-30 line, which is blended with OH. Solid lines show fits using transitions belonging to the “warm” gas component; the CO 30–29 line at 87.19 μm is therefore not included. The CO rotational temperature T_rot derived from the rotational diagram is labeled in each panel and the value in parenthesis indicates its uncertainty.