Radial temperature profiles of the 22 cores. Each panel shows the binned radial temperature profile derived from the H₂CO (green) and CH₃CN (blue) temperature maps shown in Fig. C.1. The data points used for the radial profile fitare shown by corresponding colored errorbars, the data points excluded from the fit are indicated by grey errorbars. The outer radius of the temperature fit is shown by the vertical purple dash-dotted line. The inner unresolved region is shown as a grey-shaded area. The linear fit and the ± 1σ uncertainty are shown by the solid and dashed red lines, respectively.