The OMC-1 core ¹³CO J = 8−7 integrated intensity [+5,  +15] km s^-1 image overlaid with the C¹⁸O J = 6−5 [+4,  +12] km s^-1 contours running from 15 to 65 K km s^-1 in steps of 10 K km s^-1, and the subsequent contours are plotted from 80 to 200 K km s^-1 in steps of 30 K km s^-1. The ¹³CO J = 8−7 (black) and C¹⁸O J = 6−5 (red) spectra are shown for Orion BN, Orion South, Orion Bar, and Orion East at the same positions as in Fig. 1. Both images have been smoothed using Gaussian profiles (a width of 71 for ¹³CO J = 8−7 and 95 for C¹⁸O J = 6−5) from their original Nyquist-sampled images. The black stars mark the positions of the five Trapezium stars. The original beam sizes are shown at the bottom left of the image for ¹³CO J = 8−7 and C¹⁸O J = 6−5 in red (75) and white (101), respectively.