Redshift distributions (photometric or spectroscopic) for millimeter-selected galaxies. The blue solid line shows the redshift distribution of our ALMA GOODS-South blind survey. The green dashed line shows the Hubble Ultra Deep Field Survey redshift distribution (Dunlop et al. 2017), the black dash-dotted line shows the ASPECS sample (Aravena et al. 2016), the red dotted line shows the ALMA Frontier Fields survey (González-López et al. 2017) and the yellow dotted line shows the ASAGAO survey (Ueda et al. 2018). Short colored lines at the top of the figure indicate the median redshifts for these four studies.