符号付偶数交点数列 { 6, 10, 12, 4, 2, 8 } 射影交点座標 { (R,-π/2-π/4,0,0) , (0.8r,π/2+π/4,0,0) , (R,-π/4,0,0) , (0,0,0,0) , (1.2R,π/2+π/3,0,0) , (1.3r,π/3,0,0) } 交点間中点座標 { (1.5R,π,0,0) , 0 , 0 , 0 , (r,-π/2,0,-r) , 0 , 0 , (2.1r,π/2…