Comparison of [C ii], CO(11−10), CO(7−6), CO(6−5), and CO(4−3) spectra at selected positions in the NGC 2023 region. The CO(4−3) spectra are scaled by a factor of 1.5 for clarity. CO(11−10) is scaled by a factor of three and filled with grayscale. For clarity we omitted CO(11−10) for the panel (17,113), because the spectrum is rather noisy and a clear non-detection. The temperature scale is in T_mb (K).