This article has an erratum: [https://doi.org/10.1051/0004-6361/201117056e]
The ratio between MH2 and LK as a function of morphological type. Triangles denote the mean value and its error for a range of morphological types and squares denote the median values, calculated treating upper limits as detections, as listed in Table 6. The error bars in the x-direction denote the range of morphological types over which the mean and median have been taken.
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