SFR–L_[C II] relation for the five serendipitous lines detected in continuum. The SFR of the serendipitous sources was computed from the IR luminosity. We can see that the sample is quite consistent at 1σ (colored area) with the De Looze et al. (2014) relation (purple line), suggesting that the contribution from the UV–traced SFR is negligible. We compare our results also with the models of Lagache et al. (2018) at z = 5 that suggest a slightly different slope. We also show the ALPINE UV–targets from Schaerer et al. (2020). Both the serendipitous sources and the ALPINE targets seems to suggest no evolution of the relation of De Looze et al. (2014).