Kernel density estimation (KDE) showing the probability distribution of the spectral index for the sources detected in G14.2 for which it has been possible to determine the origin of the radio continuum emission. The black dashed line at α = −0.1 draws the boundary between thermal emission and nonthermal emission. Solid lines show the median value of the spectral index for G14.2-N (black) and G14.2-S (gray).