Integrated intensity maps of the main detected lines in our IRAM observations. The sources s1454 (North clump) and s1446 (NGC 2264 H) are indicated in each frame. A scale bar is shown in frame a. The ellipses in frame b show the GCC sources with the same colour code as in Fig. 2: red for protostellar, blue for starless, and black for undetermined. The black and red squares in frame c show the areas where the average spectra in Fig. 5 were computed. The structures named “the arc” and “the bar” are shown in frame e.