Sagittarius stream according to a sample of candidate members in sample of (candidate) variable RR Lyrae stars by Hernitschek et al. (2017) in one projection across longitude of the Sagittarius stream coordinate system as defined by Vasiliev et al. (2021) (implemented in GALA Price-Whelan 2017), and heliocentric distance. For each (candidate) RR Lyrae, we colour-code the marker by the latitude in the same Sagittarius stream coordinate system. The top half of the mapped Sagittarius stream at between 135° and 180° longitude (see lower panel for enlarged plot of this part), includes the BHB stars in our sample plotted with distinct colours based on their ID (in the label of the colour scheme we only show the number at the end of the ID). The grey-shaded regions (dashed lines) represent the regions where the sample of (candidate) variable RR Lyrae stars by Hernitschek et al. (2017) are incomplete.