Table 3: Comparisons of fine-structure energy levels (in cm-1) for Ti XI. CSS; measurement of Churilov et al. (1989); NIST: (http://www.nist.gov); CFF: calculation by Fischer (2002) and BF: calculation by Fawcett (1983). (a) and (b) in the present calculation represents fine-tuned and ab initio energies respectively.
Index Conf. Level NIST CSS Present(a) Present(b) CFF BF Leading$\%$

1		 $\rm 3s^2$ $\rm ^1S_0$ 0.0 0.0 0.0 0.0      
2 3s3p $\rm ^3P_0$ 173200 173216 173306.4 171859.6 172733.1 173087 100
3   $\rm ^3P_1$ 175753 175747 175849.4 174235.1 175298.4 175710 99
4   $\rm ^3P_2$ 181400 181371 181500.6 179456.4 180924.8 181525 100
5   $\rm ^1P_1$ 258973 258972 258877.8 262236.9 258412.5 258973 97
6 $\rm 3p^2$ $\rm ^1D_2$ 408820 408880 406925.6 407887.1 408537.6 409487 73, 22(14), 4(9)
7   $\rm ^3P_0$ 410640 410610 410712.4 411237.9 410334.0 410450 99
8   $\rm ^3P_1$ 415150 414132 415245.8 414412.7 414010.1 414094 100
9   $\rm ^3P_2$ 420700 420667 420675.0 420309.4 420578.9 420901 94, 6(6)
10   1S0 482840 482832 482957.8 486861.3 482835.1 482687 94, 4(6)
11 3s3d $\rm ^3D_1$ 499840 499808 499965.7 502305.4 500895.0 500264 100
12   $\rm ^3D_2$ 500160 500163 500285.7 502682.6 501101.0 500745 100
13   $\rm ^3D_3$ 500650 500633 500775.8 503272.7 501670.3 501474 100
14   $\rm ^1D_2$ 564604 564513 566852.5 573423.4 565426.2 565226 76, 21(6)
15 3p3d $\rm ^3F_2$ 683920 683850 684021.2 684746.6 684576.2 683968 93, 6(18)
16   $\rm ^3F_3$ 687580 687587 687689.1 688243.5 688557.1 687997 100
17   $\rm ^3F_4$ 691980 691958 692102.0 692334.1 693155.3 692615 100
18   $\rm ^1D_2$ 694610 694742 694734.2 695731.5 695077.0 694567 93, 6(15)
19   $\rm ^3P_2$   724697 724947.2 728183.6 725496.8 723438 73, 26(24)
20   $\rm ^3D_1$   725636 725949.1 729096.1 726470.8 728969 62, 38(22)
21   $\rm ^3P_0$   729721 729864.4 732538.5 730786.7 728288 100
22   $\rm ^3P_1$   730362 730298.5 733328.8 731329.1 724085 62, 38(20)
23   $\rm ^3D_3$ 730564 730567 730684.8 734011.7 731421.3 729485 100
24   $\rm ^3D_2$   730835 730882.0 733994.6 731724.6 729586 74, 26(19)
25   $\rm ^1F_3$   781821 782018.4 791611.8 783298.1 785934 99
26   $\rm ^1P_1$ 750220 791982 792428.8 802604.3 793450.7 792598 96
27 $\rm 3d^2$ $\rm ^3F_2$   1008527 1008656.0 1012362.7 1010796   100
28   $\rm ^3F_3$   1008991 1009113.1 1012962.2 1011513   100
29   $\rm ^3F_4$   1009602 1009726.8 1013719.0 1012096   100
30   $\rm ^1D_2$   1031369 1031635.7 1038041.0 1033485   95
31 $\rm 3d^2$ $\rm ^1G_4$   1032316 1032525.1 1040011.3 1035235   99
32   $\rm ^3P_0$   1034687 1034835.9 1039749.4 1037061   99
33   $\rm ^3P_1$   1034869 1035025.8 1039972.9 1037424   99
34   $\rm ^3P_2$   1035200 1035300.8 1040470.4 1037568   97
35   $\rm ^1S_0$   1098008 1098906.9 1107333.6 1099036   89, 7(36)


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