Top: Spitzer/IRAC 8 μm image of the Galactic center region showing both CH₃OH and H₂O masers. Circles indicate the positions of the H₂O masers identified in the Mopra survey and the masers identified by Walsh et al. (2011). The size of the circle represents the FWHM of the Mopra beam at 22 GHz. The × symbols indicate the positions of H₂O masers identified by Caswell et al. (2011), and crosses (+) show the position of CH₃OH masers (the size of the × symbols and the crosses have no physical meaning). We consider a CH₃OH maser to be associated with a H₂O maser when it falls within the H₂O maser beam. For details on these associations, including their velocity information, see Table B.2. Bottom: same as the top figure, but with a blank background instead of the 8 μm image.