Normalized counts (number of sources per bin divided by the total number of sources) vs. peak flux for the new methanol masers detected at Arecibo (black solid line) and for the AMGPS (Pandian et al. 2007, 2009; red dashed line). The rms noise level in our spectra was ~5–10 mJy (shown by the dash-dotted vertical line) in each spectral channel (see Table C.1).