Temperature maps derived with the HCN-to-HNC intensity ratio. In each panel, the temperature is shown in color and the 3 mm continuum in black contours. The dotted black contour marks the −5σ_cont level. The solid black contours start at 5σ_cont, and contour steps increase by a factor of 2 (e.g., 5, 10, 20, 405σ_cont). The synthesized beam size of the continuum and line data is shown in the bottom-left and bottom-right corner, respectively. The continuum fragments are classified into dust cores (red), dust+ff cores (orange), and cometary UCHII regions (cyan), further explained in Sect. 4.1. Fragments with S/N < 15 are not analyzed in this study and are labeled in gray.