Effect of different spectral indices on the linear fit of the FIRC with stellar mass and how our fits compare to those of Delvecchio et al. (2021). The solid lines show our relation depending on the choice of spectral index (see legend) and the dashed line shows the fit from Delvecchio et al. (2021) when converted to 150 MHz with the same spectral index. The black points show galaxies that are detected at 150 MHz and the blue points show galaxies that have upper limits on there flux at 150 MHz.