Evolution (vertical points) of clusters’ Roche-volume filling factors − λ as a function of orbital eccentricities e = 0, 0.33, 0.5 for the two values of orbital apocentres r_apo = 10 and 3 kpc. With different coloured circles we represent the different values of global SFE. All the basic runs start with the default λ₀ = 0.09. Additionally, the set of three runs with the two-times smaller λ₀ = 0.045 presented with the crosses. Filled circles represent the planar orbits (Z = 0), while non-filled circles represent the non-planar orbits. The range of the observed λ based on the OC data from Gaia DR3 is shown in light red, and the MWSC catalogue is shown in light blue.