i′ − z′ versus z′ colour magnitude diagram for galaxies in the Wide 1 field. Black points represent the entire galaxy sample. Red+magenta dots are the galaxies corresponding to our present selection (z′ ≤ 22.5 and 0.1 ≤ zphot ≤ 1.15). Magenta dots are objects included with our present selection that would not have been included with the i′ ≤ 23 selection of A10. Green dots are objects included by the A10 selection but not by the present selection. The limit to the black points is due to a magnitude cut in the initial catalogue of galaxy photometric redshifts at i′ < 24 or y < 24 (depending on the i filter available).