Main-sequence (SFR vs. M_star) relation for the ELAIS N1 and COSMOS fields in four redshift bins. In blue we show the LSST-like sample, and in black the real sample. The solid black line represents the MS by Speagle et al. (2014), and the dashed lines mark the loci two times above and below the MS. This plot shows a clear SFR overestimate obtained using LSST bands alone, which tends to disappear at higher redshift ranges.