Fig. 4

image

Map of the total flux measured in the GRP, G, and GBP bands, where the flux in these bands is encoded in the red, green, and blue channel, respectively. There is one easily visible artefact in this map, a “green” patch to the lower left of the bulge which is a region where GBP and GRP data are not available for a large number of sources, leading to the greenish colour which was used to encode the G-band fluxes (which are available for all sources). Such artefacts also occur (although not as visible) in the region to the upper left of the Small Magellanic Cloud and at high Galactic latitude to the right of the north Galactic pole region. The areas where green patches are likely to occur can be identified in Fig. 27 in Evans et al. (2018) which shows the celestial distribution of Gaia DR2 sources for which no BP/RP photometry is available.

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