Normalized spectroscopic (blue) and photometric (red) redshift counts within a 1 arcmin radius around each cluster candidate. The total number of galaxies, N, within this radius is indicated in the legend of the figure for each redshift type. The number of galaxies per redshift bin is obtained by multiplying N by the normalized counts. If the NIKA2 cluster candidate has a redshift estimate (see Table 1), its redshift is represented by a black dashed line.