Observed 1D spectra (grey curves) of the SFGs detected in our survey, without spectroscopic rest-frame UV counterparts (DB8, DB12, DB22, z2LAE2, BX4, BX7, BX14). [OIII]doublet and Hα regions are shown. If only one of these is detected, red vertical dashed lines indicate the location of Hα ([OIII]5007) lines which would be implied by the detected-line redshift for DB8, DB22, z2LAE2 (BX4). Dashed grey vertical lines indicate the wavelength of sky emission lines, which could leave residuals in the science spectra. Horizontal dashed blue lines represent the continuum rms in the wavelength range where we did not see an expected emission line.