Selection of cluster members based on data from Gaia DR2. Left panel: proper motion diagram of the field of NGC 2516. The members finally selected and satisfying at least two membership criteria are highlighted in black. All stars within the black circle (with radius of 1.3 mas yr⁻¹; see upper right panel) are considered proper motion members. Top right panel: number of stars with proper motions against distance from the mean cluster proper motion. The vertical dotted line at 1.3 mas yr⁻¹ marks the transition from non-linear to linear growth (indicated by the solid line), i.e. the transition from open cluster members to field stars, correspondingly used as the radius for the circle on the left plot. Bottom right panel: histogram of Gaia DR2 parallaxes of the field (upper line) and the finally selected members (filled histogram). Stars between the vertical dotted lines are accepted as parallax-based cluster members.