Upper frame: contours showing our IC 342 NH₃ (J,K) = (2,   2) image smoothed to the same resolution as the Montero-Castaño et al. (2006) NH₃(6, 6) emission image. The gray scale shows the 1.3 mm continuum, and the asterisks denote the three (6, 6) ammonia peaks. The H₂O maser detected by Tarchi et al. (2002) is indicated as a cross, while the box indicates the area depicted in Fig. 1. Lower frame: Boltzmann plot for IC 342 peak C and the “continuum” peak using the measured (1, 1), (2, 2) and (6, 6) transitions of NH₃.