Cutouts of the 34 [CII] nondetections centered on their optical positions. Depending on the method used to preselect each galaxy before the spectroscopic observation, that is Lyman-break, Lyα, or i-band dropout selection, we show the emission from the Subaru broad-band i⁺ and narrow-band NB816 filters (Taniguchi et al. 2007, 2015; Laigle et al. 2016), or from the HST/ACS F850LP (Giavalisco et al. 2004), respectively (see Faisst et al. 2020). Each image is 3″ × 3″ wide. Gray contours show 3, 5, and 7σ optical emission. Black contours (if present) represent 2 and 3σ ALMA [CII] emission. The name of each nondetection, as well as the filter used, are reported in the upper-left corner of the corresponding cutout.