Table 3: Comparison of calculated energies for Fe XX levels with data compiled by NIST ( $E^{{\rm NIST}}$). $E^{{\rm SS}}$ - energies calculated by Mason & Bhatia (1983) with SUPERSTRUCTURE, $E^{{\rm BPRM}}$ - values obtained by Nahar (2004) with Breit-Pauli R-matrix code, $E^{{\rm GRASP}}$ and $E^{{\rm CITRO}}$ - our values. Indexes of levels in the first column and CSFs in the second column are taken from Table 1. Energies are in cm-1.
Index CSF $E^{{\rm NIST}}$ $E^{{\rm SS}}$ $E^{{\rm BPRM}}$ $E^{{\rm CITRO}}$ $E^{{\rm GRASP}}$
2 2s2 2p3 2D1.5 138620 140598 140903 138856 141715
3 2s2 2p3 2D2.5 176130 178989 181615 175952 179537
4 2s2 2p3 2P0.5 260270 257573 264577 260471 263209
5 2s2 2p3 2P1.5 323340 319877 328554 322368 325962
6 2s1 2p4 4P2.5 752730 747101 757407 750386 753649
7 2s1 2p4 4P1.5 820820 812698 824127 817703 821409
8 2s1 2p4 4P0.5 842740 834443 846184 839423 843536
9 2s1 2p4 2D1.5 1042570 1044277 1050625 1039244 1050924
10 2s1 2p4 2D2.5 1058360 1061216 1068073 1055467 1066222
11 2s1 2p4 2S0.5 1195260 1195284 1205245 1192125 1205489
12 2s1 2p4 2P1.5 1242430 1251404 1253310 1239208 1255768
13 2s1 2p4 2P0.5 1340040 1345312 1351305 1336259 1352396
14 2p5 2P1.5 1954520   1966690 1948441 1971784
15 2p5 2P0.5 2062200   2076076 2055642 2079179
16 2s2 2p2 (3P) 3s1 4P0.5 7194000 7193289 7162927 7182452 7155228
17 2s2 2p2 (3P) 3s1 4P1.5 7255000 7256327 7229209 7247014 7221726
18 2s2 2p2 (3P) 3s1 2P0.5 7287000 7286360 7259935 7277194 7252311
19 2s2 2p2 (3P) 3s1 4P2.5 7299000 7299603 7274815 7288611 7264310
20 2s2 2p2 (3P) 3s1 2P1.5 7331000 7330953 7306639 7320048 7296115
23 2s2 2p2 (1D) 3s1 2D2.5 7430000 7430336 7411460 7422476 7400563
24 2s2 2p2 (1D) 3s1 2D1.5 7440000 7439775 7421293 7432236 7410643
33 2s2 2p2 (1S) 3s1 2S0.5 7554000 7551182 7545340 7555745 7530985
39 2s2 2p2 (3P) 3d1 4F1.5 7672000 7650500 7646562 7663219 7638491
46 2s2 2p2 (3P) 3d1 4F3.5 7740000 7714100 7722324 7736076 7712951
47 2s2 2p2 (3P) 3d1 4D0.5 7752000 7721000 7727811 7743115 7720580
56 2s2 2p2 (3P) 3d1 4P2.5 7802000 7790100 7796375 7806999 7785892
58 2s2 2p2 (3P) 3d1 4P1.5 7802000 7803000 7808139 7818763 7798298
61 2s2 2p2 (3P) 3d1 2F3.5 7820000 7818200 7830306 7839918 7819869
62 2s2 2p2 (3P) 3d1 2D1.5 7859000 7850700 7853131 7864123 7844676
63 2s2 2p2 (3P) 3d1 2D2.5 7843000 7854500 7854097 7865251 7846514
69 2s2 2p2 (1D) 3d1 2D1.5 7919000 7909800 7925646 7933796 7915116
70 2s2 2p2 (1D) 3d1 2D2.5 7913000 7918200 7929859 7937908 7919464
71 2s2 2p2 (1D) 3d1 2P0.5 7964000 7931300 7947242 7953974 7936656
72 2s2 2p2 (3P) 3d1 2F3.5 7935000 7944100 7950051 7958832 7941761
79 2s2 2p2 (1D) 3d1 2S0.5 7995000 7960100 7979856 7986462 7969218
80 2s2 2p2 (3P) 3d1 2D2.5 7983000 7969000 7980602 7988008 7971406
82 2s2 2p2 (1D) 3d1 2P1.5 7967000 7966700 7984157 7989830 7974014
85 2s2 2p2 (1S) 3d1 2D2.5 8047000 8069800 8065978 8072444 8051967
86 2s2 2p2 (1S) 3d1 2D1.5 8061000 8080900 8075722 8083172 8063693

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