CO(3–2) map over the NGC 2023 & NGC 2024 survey field, integrated over the same velocity range (9–12 km s⁻¹) and convolved to the same 31′′ beam as in Fig. 2 of Pety et al. (2017), along with their CO(1–0) velocity integrated map, and the ratio of the CO(3–2)/CO(1–0) maps (where the ratio was computed for all pixels with a CO(3–2) line brightness temperature greater than 2 K, i.e. excluding pixels with noisy ratios due to low signal-to-noise ratios).