For 3 different ¹²CO column densities, RADEX modeling results are shown for ¹²CO J = 6 → 5 peak main-beam brightness temperatures and corresponding ¹³CO J = 4 → 3/¹³CO J = 6 → 5 ratios. The blue lines denote the RADEX modeling results for different kinetic temperatures at 3 different volume densities, and color points represent data from near the HII region, PDR, and molecular cloud (see Sect. 4.3). Each point denotes a ¹²CO J = 6 → 5 temperature and ¹³CO J = 4 → 3/¹³CO J = 6 → 5 temperature ratio obtained from a single pixel. Data points are extracted from peak temperature maps convolved to the same resolution of 16′′. (a) The data points plotted are obtained for a ¹²CO column density range of 8 × 10¹⁷ –1.8 × 10¹⁸ cm⁻² and for modeling the chosen input ¹²CO column density is 1 × 10¹⁸ cm⁻². (b) The data points plotted are obtained for a ¹²CO column density range of 1.8 × 10¹⁸ –3.5 × 10¹⁸ cm⁻² and for the modeling the input ¹²CO column density is 2 × 10¹⁸ cm⁻². (c) The data points plotted are obtained for a ¹²CO column density range of 3.5 × 10¹⁸ –5.1 × 10¹⁸ cm⁻² and for the modeling input the ¹²CO column density is 4 × 10¹⁸ cm⁻².