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Fig. 4

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Comparison of the M 82 and NGC 253 fractional abundances of different molecules with respect to the C34S (3 − 2) abundances. All the fractional abundances have been calculated from the millimeter frequency surveys of Martín et al. (2006b) and this paper except for: a) C18O: Martín et al. (2009a); b) C18O, HCO, HOC+, and H13CO+: Martín et al. (2009b); c) CH3CCH, CS and HC3N: Aladro et al. (2011); d) CO+: Fuente et al. (2006); e) HOC+: Aladro et al. (in prep.).

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