14.1.5 BP and RP mean spectra

The BP and RP spectra are published for some 220 M sources. For each source we give 55 coefficients to a set of basis functions for the BP spectrum and in addition 55 coefficients to a (different) set of basis functions for the RP spectrum.

Tests include:

• •

  The general properties of the coefficients are discussed in Section 14.2.4;

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  The shape of the spectra and the capacity for producing a coarse stellar classification from the coefficients are discussed in Section 14.2.4;

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  Section 14.2.4 discusses that the integrated fluxes from the spectra show relatively large differences – under certain circumstances – to the XP mean photometry;

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  Analysis of stars in clusters, Section 14.7.2, suggests deficient quality in the colour range $G_{\mathrm{BP}}-G_{\mathrm{RP}}$ 1.0–1.5;

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  Tests using clusters also suggest that the uncertainties on the spectral coefficients are underestimated by a factor between 1.2 and 1.5, cf. Section 14.7.2.