The core of Stock 18. Left: Gaia chart for all stars (members and non-members alike) in the central 1.2′×1.2′ of Stock 18. Symbol size represents G₃′ magnitude, symbol color G_BP, 3 − G_RP, 3, and arrows proper motion. Stars without G_BP, 3 − G_RP, 3 are shown without a color. The proper motions have the mean value derived for sample 1 subtracted. The purple square indicates the region shown in the right panel. Right: AstraLux z lucky image of the GLS 13 370 system, indicating the five WDS components with A divided into Aa and Ab. The intensity scale is logarithmic to show both bright and faint sources.