Redshift distribution of the 243 Chandra J1030 sources with an optical and/or IR counterpart. The black solid line shows the overall distribution computed using the best-fit redshift value, while the gray dashed line shows the distribution obtained by summing all the redshift probability distribution function values (for photometric redshifts; spectroscopic redshifts are assumed to have PDZ = 1 at their z_spec value). The spectroscopic redshift distribution is shown as a red solid line.