Simulated relative density (grey scale) and selected magnetic field lines during the formation phase of flux ropes (FRs), in the case of: first row – CME1; second row – CME2 (double eruption case); third row – second FR (FR2) which falls back to the Sun; fourth row – stealth eruption; fifth row – failed eruption. The green circles indicate reconnection sites. The relative density is , where ρ₀ is the density of the initial relaxed state before the shear.