成分開始交点数列 { 1, 5, 9 } 符号付偶数交点数列 { 10, 12, 4, 2, 8, 6 } 射影交点座標 { (r2,-π/2,0,0) , (r1,π/2,0,0) , (r1,-π/6,0,0) , (r2,5π/6,0,0) , (r2,π/6,0,0) , (r1,-5π/6,0,0) } 交点間中点座標 { (r3,-5π/6,0,0) , 0 , 0 , 0 , 0 , 0 , (r3,…