Histogram of p-values from normality tests for the distribution of residual values for all GRS spectra (blue) and GRS spectra that have at least one fit component (black). The inset shows the same distribution on a logarithmic scale. The dashed vertical line marks the default p-value limit, below which GAUSSPY+ tries to refit spectra if possible. The grey-shaded area marks the IQR for the distribution of spectra with fitted components, ranging from about 0.03−0.3. The bin width is 0.02 dex.