MZR using the metallicity parametrisation from Kobulnicky & Kewley (2004, left) and Tremonti et al. (2004, right). In both panels the galaxies from Lockman-SpReSO are colour-coded according to L_TIR. The red triangles are the galaxies from the paper by Oi et al. (2017). The shadows and contours in the background represent the merged galaxies from the OSSY catalogue (Oh et al. 2011) and the HELP catalogue (Shirley et al. 2019). The mean error is shown in red at the bottom left.