G cluster_1 Linear Angle Variations (white to black gradient) cluster_2 Radial Angle Variations (white to black gradient) n9 n8:360 n8 n8:315 n7 n7:270 n6 n6:225 n5 n5:180 n14 n14:180 n5->n14 n4 n4:135 n3 n3:90 n2 n2:45 n1 n1:0   n18 n17:360 n17 n17:315 n16 n16:270 n15 n15:225 n13 n13:135 n12 n12:90 n11 n11:45 n10 n10:0