Distribution of spectroscopic redshift measurements for all objects in the full FMOS-COSMOS catalog, split by their quality flags. The FMOS z_spec distribution is compared with VUDS (Le Fèvre et al. 2015; gray histograms) in the middle panel. The bottom panel shows a zoom-in of the range 1.42 ≤ z ≤ 1.76 with a finer bin size (Δz = 0.002) for objects with an Hα detection in the H-long band. Histograms are color-coded by ﹩{\rm{S}}/{\rm{N}}({\rm{H}}\alpha )﹩ as labeled. The gray stripes indicate the positions of the OH airglow lines, which are converted to redshift with the wavelength of Hα.