Fig. 5

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Distribution of CO line ratios at 27 arcsec. The violin plots are colour-coded: blue indicates ratios of fixed CO isotopologue but different transitions, while red (vertically hatched) and green (diagonally hatched) show ratios of different CO isotopologue but fixed transition. The number of significant data points (S/N > 5) for each line ratio is indicated with n and the saturation of the colour of each violin. The percentage in terms of total detection is also indicated (with respect to S /N > 5 detected 12CO(1–0) data points). In the inset panel, we show the effect of increasing the S/N cut from S /N = 5–60 for the 12CO(2–1)/(1–0) line ratio. We do not find a significant difference in terms of the mean line ratio with increasing S/N.
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