Spectra of CO(3−2), CO(4−3), and CO(6−5) toward MIR-73. The ¹³CO(3−2) spectrum is overlaid in red on top of the CO(3−2) spectrum. The CO spectra are offset from each other by 15 K for clarity. The vertical gray line marks the systemic velocity, ~10.4 km s⁻¹. The narrow emission feature at 5.2 km s⁻¹ is due to an IR dark cloud filament and not related to the outflow from MIR-73.