Helicity and its decomposition in the medium arcade simulations for the non-eruptive (top panel) and eruptive (bottom panel) cases. The (black, red, yellow) curves corresponding to [H_V,2H_pj,H_j], respectively. The helicities are computed using the (DV bot, DV top, DV-C bot, DV-C top) gauge sets, corresponding to the [three-dot-dashed, dashed, dot-dashed, continuous] curves, respectively.