Photometric redshift in SMACS0723 Left: distribution of the detected objects as a function of redshift in the entire field of view (blue) and in the 40″ × 40″ box around the two spectroscopically confirmed galaxies at z = 7.66. The histograms are normalised to 1. A small excess of z ≥ 7 sources is observed in the protocluster region compared to the entire field of view. Right: redshift probability distribution for the six protocluster members candidates identified in this study. The distribution is compatible with a spectroscopic redshift of z = 7.66 (vertical dashed red line).