Temperature maps using also the H¹³CN/HN¹³C ratio. Top panel: temperature map derived from the integrated intensity ratios of the H¹³CN(1–0) and HN¹³C(1–0) line following the procedure outlined in Hacar et al. (2020) for the main isotopologs. The five-point stars mark the 3.6 mm continuum peak positions of region A and B. The bottom panel presents the corresponding temperature map where the temperatures derived from HCN/HNC and Hⁱ³CN/HNⁱ³C are combined (see main text for procedure).