Power spectrum of the t_reion(r) field obtained with the model ζ30 at z_obs = 8, including instrumental effects for a typical SKA observation. The black line and hatched area stand for the mean and standard deviation of the true field P(k). The dotted lines and shaded area depict the median and dispersion (1st and 99th percentiles) of CNN predictions P(k) with (blue) and without (red) instrumental effects.