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. 2015 Sep 25;10(9):e0138073. doi: 10.1371/journal.pone.0138073

Fig 2. The grade 0–5 of head splitting resistance in DH population.

Fig 2

0 = no split; 1 = 1 split layer; 2 = 2 split layers and S < 50; 3 = 3–5 split layers and S < 50, or 2 split layers and S ≥ 50; 4 = 6–10 split layers and S < 50, or 3–5 split layers and S ≥ 50; 5 = more than 10 split layers, or 6–10 split layers and S ≥ 50. a = arc length and b = width of the largest split; c = height of the head and d = the largest circumference of the head. S [%] = S1/S2 × 100%, where S1 = a × b and S2 = c × 1/2 d.