0.          0.                3s2 3p6 1S               3p6 1S                    
   1.    1701800.                3s2 3p5(2P1)4f 2[1+]     1)4f 2[1+]          
   2.    1704300.                3s2 3p5(2P1)4f 2[1+]     1)4f 2[1+]          
   2.    1739400.                3s2 3p5(2P0)4f 2[2+]     0)4f 2[2+]          
   3.    1708300.                3s2 3p5(2P1)4f 2[2+]     1)4f 2[2+]          
   3.    1732900.                3s2 3p5(2P0)4f 2[2+]     0)4f 2[2+]          
   3.    1736000.                3s2 3p5(2P0)4f 2[3+]     0)4f 2[3+]          
   4.    1708600.                3s2 3p5(2P1)4f 2[4+]     1)4f 2[4+]          
   4.    1716400.                3s2 3p5(2P1)4f 2[3+]     1)4f 2[3+]          
   4.    1736400.                3s2 3p5(2P0)4f 2[3+]     0)4f 2[3+]          
   5.    1706400.                3s2 3p5(2P1)4f 2[4+]     1)4f 2[4+]