Top panel: A − C scatter plot for our model GRAD2 (Table 1), assuming quasi-parallel injection and an age of 1000 yr. Different colors correspond to different values of φ_∇|B| (from 0° to 90° in steps of 15°), whereas each dot corresponds to a given value of φ_B (from 0°, right, to 90°, left, in steps of 2°). We overplotted the (A, C) values measured for SN1006 (diamonds; the inset shows a zoom near this point). Middle panel: same as top panel but for the R_max − C pair. Lower panel: same as top panel but for the θ_D − C pair.