Transitions of methanimine CH₂NH, ν = 0 covered by the ReMoCA survey. The best-fit LTE synthetic spectrum of CH₂NH, ν = 0 is displayed in red and overlaid on the observed spectrum of Sgr B2(N1S) shown in black. The blue synthetic spectrum contains the contributions of all molecules identified in our survey so far, including the species shown in red. The central frequency is indicated (in MHz) below each panel, the half-power beam width is on the left, the width of each panel (in MHz) is in parentheses, and the continuum level of the baseline-subtracted spectra in K is in brackets. The y-axis is labeled in brightness temperature units (K). The dotted line indicates the 3σ noise level.