Contour plots of the DTW path distance as a function of minimum and maximum inner boundary velocity for Carrington rotations (a) 2150 and (b) 2202. The white contour bounds the area that yields a DTW path distance under the threshold chosen (SSF ≤ 0.95), and the white pixels in the lower right corner represent invalid model parameters where V_min > V_max. Note that the V_max range is altered to 300–600 km s⁻¹ in this plot.