Upper panels: a region of the sky including a nearby multiple-cluster system, lower panels: a region with a large number of clusters identified in the optical within SDSS data. From left to right: Planck tSZ MILCA map, neural network weight, match-filtered MILCANN map, for patches of 8.5 × 8.5° in gnomonic projection centered on galactic coordinates (l, b) = (264°, −24°) and (l, b) = (11.5°, 70°). Gray regions are masked due to point-source contamination. We display objects from the HAD catalog (presented in this paper) as black circles, from the PSZ2 catalog as black diamonds, and from redMaPPer (when available) as black squares.