Stellar masses and SFRs derived from SED fitting in our spectroscopic sample at 0.8 <  z <  0.9, showing the primary (filled circles) and secondary (open circles) targets separately (left). Colour-magnitude diagram for the same sample (right). For comparison, we show the derived best-fit relation for star-forming galaxies computed at z = 0.84 using the equation derived by Whitaker et al. (2012) over a large average volume in the COSMOS field (the dashed line is an extrapolation below their stellar mass completeness). The vertical dotted line shows the approximate stellar-mass representativeness limit of our survey. The dotted contours show the COSMOS2015 distribution of galaxies with 0.8 <  z_phot <  0.9 and i_AB <  22.5 from 10% to 90% of the sample in 10% steps.