Rotation or population level diagram for NGC 1140. A beam correction has been applied to the integrated intensities (see Sect. 4 for more details). Both ¹²CO and ¹³CO transitions are shown, as indicated by open (red) circles and filled (blue) squares, respectively. The gray dashed line for ¹²CO corresponds to the best-fit regressions; the temperature for ¹³CO is ill determined with only two transitions, so we fixed it to the ¹²CO value of T_ex = 18.1 K.