Best-fit light curves from the joint analyses of AT2017gfo/GRB170817A for selected photometric filters. The red data points show their 1σ error bars. The best-fit light curves from the analysis with AFTERGLOWPY (PYBLASTAFTERGLOW) are drawn as solid lines in light-blue (magenta). The colored bands indicate the 1σ systematic uncertainty as determined from the systematic nuisance parameters sampled for this light curve.