Phase portraits of periodic dynamo solutions in the ℰ_0y vs. plane (large-scale axisymmetric EMF vs. large-scale axisymmetric azimuthal field). Top: lower branches of the two cycles LB₁ and LB₂ computed in a large aspect ratio box L_y/L_x = 28.57 (see H11 and R13). Bottom: new chimera lower branches LB_1m and LB_2m computed in moderate aspect ratio boxes (0.7,6,2) and (0.5,2,1). The dashed lines indicate the linear trend between ℰ_0y and .