HE 1108-2813. 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), 3, 4, 5, 6) × 1σrms - int (=0.5 Jy beam-1 km s-1). The beam size is 4.5′′ × 3.0′′. Bottom: the 12CO(2–1)/13CO(2–1) luminosity ratio with black contours in steps of 5, 10, 20, 30, 40. Gray contours show the naturally weighted integrated 12CO(2–1) flux as in Fig. 8.
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