Transitions of vinyl isocyanate trans-C₂H₃NCO covered by the ReMoCA survey. The LTE synthetic spectrum used to derive the upper limit on the column density of trans-C₂H₃NCO, v = 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 megahertz (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 Kelvin (K) in brackets. The y-axis is labeled in brightness temperature units (K). The dotted line indicates the 3σ noise level. The figure only shows the transitions of trans-C₂H₃NCO for which the red synthetic spectrum has a significant peak temperature (compared to the noise level) and which are not too heavily blended with much stronger emission of other molecules.