Calibration of the criterion for redshift reliability, p, using simulated spectra. The p value quantifies the probability that the measured redshift lies within Δz  =  0.01 of the true redshift. The x-axis shows the p value estimated from the P(z) of the simulated spectra, and the y-axis is the actual fraction of the simulated redshift measurements that lie within Δz  =  0.01 of the true redshift. The line of perfect agreement is shown wish a dashed black line. The relation obtained with C  =  2 (see text) is shown with colored lines for simulated spectra of different K-band magnitude (the S/N given in parentheses corresponds to 70 Å bins), and for all magnitudes combined in black. All simulated galaxies with K  =  22 had an estimated p ∼ 100% and are therefore shown as a single data point in the top-right corner. The relation for all magnitudes and C  =  1 is shown in gray for comparison.