Lines of vinyl acetate, CH₃COOCHCH₂, towards the compact ridge of Orion KL. The black histogram is the averaged spectrum over 5 × 5 pixels around the methyl acetate peak (see text) of the ALMA SV data (see text for references); these data have a 0.5 MHz of spectral resolution. The thin red line is the synthetic spectrum assuming a column density of 2 × 10¹⁵ cm^-2 for vinyl acetate (A+E species). The thin blue line is the model for vinyl acetate with a column density of 1 × 10¹⁵ cm^-2 (A+E species); this model corresponds to the given column density for the tentative detection of vinyl acetate (see text). A v_LSR of 7 km s^-1 is assumed.