Cumulative distribution of the phase deviation r_P, lit at the end of the observation obtained when adopting the literature period P_lit instead of the Gaia period P_Gaia (see Eq. (6)). The sample of Gaia eclipsing-binary candidates that are also classified as eclipsing binaries in the literatures is shown by the filled grey histogram, and the sample which has literature cross-matches but with a classification other than eclipsing binary in the literature is shown by the red histogram.