Fig. 9
Histogram over number of galaxies in normalised OH megamaser luminosity. Light-grey corresponds to galaxies considered HC3N-poor, medium-gray corresponds to nearby HC3N-luminous galaxies whose HC3N/HCN ratios probably are overestimated (see Appendix A.1), dark-grey corresponds to all other HC3N-luminous galaxies, and white corresponds to galaxies where the upper limit on the HC3N/HCN ratio is too high to tell whether it is HC3N-luminous or not. The galaxies for which OH maser emission is non-detected in Darling & Giovanelli (2002) and/or Darling (2007) are stacked in the leftmost column of the histogram.
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