Best-fit XCLASS temperature for different molecular tracers. In case of definite detection in more than two transitions, CH₃OH, SO₂, and CH₃CN were free for fitting (for more details, see Sect. 3.1). There is an uncertainty of 40–60% for the temperatures. The sources are ordered by increasing mass (from Paper II), calculated with the temperature of the CH3OH (cold) component to account for the total mass in the core. The hot cores are highlighted with yellow bars.