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Fig. 6

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Correlation plots between a) monochromatic luminosities at 12 m and source luminosity; b) monochromatic luminosities at 12 m and maser component of CH3OH emission line; c) masses of HMPOs and the thermal component of CH3OH emission lines; d) the thermal and the maser component of CH3OH emission lines; e) the maser-to-thermal emission ratio and the maser emission; f) the molecular abundances of HDO and HO. Sources of our sample are labelled with numbers (1 to 10), sources studied by van der Tak et al. (2006) are labelled with letters (a to h). Solid line: best linear fit obtained with a least squares method.

(a) (b) (c) (d) (e) (f)

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