Stellar surface density of Sgr selected members (top left), possible MW stars polluting the sample inferred from the GOG model (top right), rejected contaminants (bottom left), and rejected contaminants from the GOG model (bottom right). Each row of panels shares the same color shading. The color shading for the rejected stars has been divided by 20 with respect to the top panels. Stripes crossing the data on a diagonal are due to Gaia systematic errors.