n=6, candidates for Fig. 7 (slope 11..14.5 deg, length 10..13):
   (p,q)=(13,3) slope 12.73 deg, length 11.790, N=8 polygons, end vertex X_3 = source number 4, type A0
n=5, candidates for Fig. 6 (slope 17..20.5 deg, length 11..13.5):
   slope 18.88 deg, length 12.451, N=10 polygons, end vertex X_2 = source number 4, type A0
   slope 20.49 deg, length 11.509, N=10 polygons, end vertex X_3 = source number 3, type A1
