Selection of rotational transitions of methylamine CH₃NH₂ in its first torsionally excited state covered by the ReMoCA survey. The LTE synthetic spectrum of CH₃NH₂ υ_t = 1 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 contribution of the species shown in red. The values written below each panel correspond from left to right to the half-power beam width, the central frequency in MHz, the width in MHz of each panel in parentheses, and the continuum level in K of the baseline-subtracted spectra in brackets. The y-axis is labeled in brightness temperature units (K). The dotted line indicates the 3σ noise level. The green stars highlight the lines of methylamine in its first torsionally excited state that are not excessively contaminated by emission from other species and are counted as detected lines in Table 3.