Line luminosity vs. SFR relation for the Auriga galaxies post-processed with the TODDLERS library. The SFR for the Auriga galaxies is the simulation reported value averaged over 30 Myr. The orange points represent values using an aperture (see Sect. 5.2.1) f_R, opt = 1, while the green ones are for f_R, opt = 0.33. The straight lines represent various observational relations and the associated filled areas represent the 1σ dispersion on the calibration.