Relationship between the infrared luminosity of the host galaxy and CH₃OH, OH, or CH₂NH megamasers. Galaxies with 36 GHz CH₃OH masers from Chen et al. (2016) are plotted with purple pentagons, and galaxies with CH₂NH masers are plotted with orange diamonds. OH megamasers for six of the seven CONs (all except IRAS 17578−0400) from Darling & Giovanelli (2002) and Wiggins et al. (2016) are plotted with green squares. The infrared luminosity of the galaxies are adopted from Sanders et al. (2003). The purple dotted line represents the linear best fit to the CH₃OH data from Chen et al. (2016), the orange dashed line represents the best fit to the CH₂NH data (this paper), and the green dashed dotted line is the linear best fit to the OH maser luminosities from Darling & Giovanelli (2002) and Wiggins et al. (2016).