Comparison of the photometric properties of the final X-shooter sample with the ZTF SLSN-I sample from Chen et al. (2023a). Panel a (upper): KDE distributions of M_g peak magnitudes for 78 ZTF SLSNe-I and the triggered X-shooter sample. Panel a (bottom): KDE distributions of M_g peak magnitudes for the ZTF sample, with the X-shooter detections and non-detections shown separately. Panel b: KDE distribution of (g − r)_peak for the ZTF sample, overlaid with individual measurements and 1σ uncertainties (purple lines and shaded regions) for the detection events. Panel c: KDE distributions of observed m_g magnitudes for the non-detection subsample and individual measurements of the detection events. Panels d and e: KDE distributions of the rise and decline timescales for the ZTF and non-detection subsamples, along with individual measurements for the detection events. Panel f: KDE distribution of redshifts for the ZTF sample, with overlaid redshift values of the detection events. Vertical dashed colored lines indicate the median of each distribution.