Derivations of the gas temperature from the PV diagram. a) Ratio of the median TRD derived from CS over the median TRD derived from CO (contours are 0.1 to 1 by 0.1); b) CO median TRD, with contours from 4 to 22 K by spacing of 2 K; c) CO median TRD with contours of the CS median TRD overlaid; d) difference between the CS mean temperature and the CS median TRD (contours are –0.6, –0.3, 0.3 and 0.6 K); e) median CS TRD with contours from 4 to 12 K by spacing of 2 K; f) CS median TRD with contours of the CO median TRD. The spatial resolution is indicated. The vertical line delineates the area suffering from beam dilution.