Water emission maps averaged for H and V polarizations. Integration ranges are given in Table A.1. Black solid contours represent the emission of ¹³CO 6− 5 at 95, 90, 75 and 50% of the maximum intensity integrated from 2 to 17 km s⁻¹ observed with the CSO telescope and convolved at the averaged water line H and V beam width (Table A.1). Upward and downward triangles mark the targeted observations for H and V polarizations (blue ones are for the b labeled transitions, see Tables 1 and A.1). Black dashed circle is the HIFI HPBW at the water frequency centered on the CO⁺ peak.