The integrated intensity maps of CH₃OH, CH₃NH₂, and CH₂NH transitions in W51 e1/e2. The rms noise level, δ Jy beam⁻¹, is shown at the top right. The positions of continuum sources (Gaume et al. 1993; Shi et al. 2010) are shown by circles. The triangles show the positions of hot cores, where the spectra were extracted. The velocity ranges are from 44.9 to 58.5, from 49.8 to 58.1, and from 47.0 to 60.7 km s⁻¹ for CH₃OH, CH₃NH₂, and CH₂NH, respectively. The upper energy level is shown at the bottom left of the figures.