HE 0433-1028. Top: the integrated ¹³CO(2–1) flux image for natural weighting obtained for a velocity range from −75 to +75 km s^-1. Black contours are in steps of (2 (red), 2.5, 3, 4) × 1σ_{rms - int} (=0.8 Jy beam^-1 km s^-1). The beam size is 3.9′′ × 1.6′′. Bottom: the ¹²CO(2–1)/¹³CO(2–1) luminosity ratio with black contours in steps of 2 from 4 to 18. Gray contours show the naturally weighted integrated ¹²CO(2–1) flux as in Fig. 2.