Selection of transitions of CH₂C(OH)CHO, ν = 0 covered by the ReMoCA survey. The LTE synthetic spectrum used to derive the upper limit on the column density of CH₂C(OH)CHO, 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, but does not include the contribution of the species shown in red. The central frequency is indicated in MHz below each panel as well as the half-power beam width on the left, the width of each panel in MHz in parentheses, and the continuum level of the baseline-subtracted spectra in Κ in brackets. The y-axis is labelled in brightness temperature units (K). The dotted line indicates the 3σ noise level.