Sample study of how well evolution is detected in simulated spectra. The “30%” evolution model was applied to all template spectra and the measured indicators compared with the unevolved measurements. The panels show the distribution of fractional difference, divided into the same contamination bins as in Fig. A.1. The total uncertainty in each bin (bias and dispersion) as estimated above is shown as an orange dashed line. Events where the reported difference is larger than uncertainties would be seen as deviating. In this sense detectable events are shown as hashed bins. The fraction of detected events is shown in each panel. This fraction decreases with contamination.