a) Footprint of the SLW array (target T5) over the outer western rim. b) CO rotational diagrams showing the column density per statistical weight versus the energy of the upper level. The CO rotational diagrams are measured at seven different positions along the outer western rim (SLWC2, SLWC3, SLWC4, SLWC5, SLWB2, SLWD1, and SLWD3). c) Integrated CO intensities fitted with non-LTE models at the same seven positions previously mentioned.