Distribution of spectral indices of MALS sources. Left: MALS spectral indices (black) compared to AGN (red) and star-forming galaxies (blue) from SKADS as a function of flux density. Right: MALS spectral indices as a function of flux density, sources with S/N above 20 are coloured by S/N. The median value and error of spectral indices of different flux bins are indicated by red error bars, indicating that at lower flux densities spectral indices tend towards lower values.