Transitions of a-ethyl formate, a-CH₃CH₂OC(O)H, identified toward G+0.693, which were used to derive the LTE physical parameters of the molecule (see text; listed in Table A.2). The red line shows the best LTE fit of a-CH₃CH₂OC(O)H, while the blue line represents the combined emission of all molecules identified in the survey, including a-CH₃CH₂OC(O)H (observed spectra are shown as gray histograms). The quantum numbers for each transition are shown at the bottom of each panel. The transitions are sorted by decreasing intensity. The molecular structure of a-CH₃CH₂OC(O)H is also shown (C atoms in gray, O atoms in red, and H atoms in white).