Relation between the potential and kinetic energy for gas-free TDGCs of sample A calculated by the Subfind and σ-clipping (η = 2, 3; δ = 0.01) algorithms. The black solid line highlights the condition for virial equilibrium, i.e., where the virial ratio becomes q = 1 (see Eq. (C.1)). All objects above the black dashed line are gravitationally bound (q < 2). The kinetic and potential energy for the Subfind algorithm are taken form Zjupa & Springel (2017) and the calculation for the potential energy using particles identified by σ-clipping assumes a fixed softening length in Eq. (C.11).