Colour–magnitude diagrams for the Quintuplet field. Foreground stars (F127M − F153M < 1.8 mag) are shown in blue, Galactic Centre stars in brown, and probable Quintuplet cluster members (membership probability from proper motions > 50%) as green crosses. Some foreground and background stars move along with the bulk of the Quintuplet and are therefore also shown as green crosses (see Rui et al. 2019). The probable members of the Quintuplet cluster are only shown in the left panel.