Moment 0 maps of C30α emission andC65α emission. The green contours show the C30α emission at values of 40, 60, and 80 mK km s⁻¹. The color map shows the C65α emission (Wyrowski et al. 1997). The spatial resolution of the C30α map is 28′′, while that of the C65α map is 40′′. A white box shows the extent of the region mapped by ALMA where C30α is detected (southeast map in Bally et al. 2017). The spatial axes are given in offset with respect to M 42, and a blue star indicates the position of Θ¹ Ori C.