Emission of CO isotopologs. Left: Spectra taken from a region with a radius of $0_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}5$ around the brightest component, the upper level energy of each transition is shown in the upper-right corner of each spectrum, and the horizontal red line represents 1σ. The C¹⁸O 2–1 spectrum has been multiplied by a factor of 4 for a better comparison. Right: Moment 0 maps integrated from −25 to +25 km s⁻¹, with respect to the systemic velocity (3.7 km s⁻¹). White contours represent the continuum emission at 233 GHz at a 10σ value.