Relative kinetic helicity spectrum as a function of Gr   Co for Gr = 0.03 with Co = 0.03, 0.06, 0.13, 0.49, and 0.66 (red and blue symbols) compared with results from earlier simulations of Brandenburg et al. (2012b) for Gr = 0.16 (small dots connected by a dotted line). The solid line corresponds to ϵ_f = 2Gr   Co. The two horizontal dash-dotted lines indicate the values of for which dynamo action is possible for k_f/k₁ = 5 and 30. Runs without an imposed field (blue filled symbols) demonstrate dynamo action in two cases. The blue open symbol denotes a case where the dynamo is close to marginal.