Table 1: Energy levels (in Ryd) of Fe XXVI.

Index		 Configuration Level NIST ASa GRASPb GRASPc GRASPd FACe
1 1s 2S1/2 0.00000 0.00000 0.00000 0.00000 0.00000 0.0000
2 2s 2S1/2 511.00120 511.22287 510.99499 511.25775 511.00986 511.0338
3 2p 2P$^\circ$1/2 510.95974 511.21310 510.95198 511.25775 510.96906 510.9933
4 2p 2P$^\circ$3/2 512.51892 512.73395 512.51098 512.81372 512.52826 512.5526
5 3p 2P$^\circ$1/2 606.09866 606.33270 606.09088 606.39679 606.10883 606.1371
6 3s 2S1/2 606.11160 606.34399 606.10384 606.39679 606.12097 606.1492
7 3d 2D3/2 606.56003 606.78235 606.55231 606.85815 606.57056 606.5986
8 3p 2P$^\circ$3/2 606.56095 606.78339 606.55314 606.85815 606.57117 606.5994
9 3d 2D5/2 606.71158 606.93256 606.70381 607.00928 606.72168 606.7499
10 4p 2P$^\circ$1/2 639.33370 639.56219 639.32572 639.63177 639.34406 639.3737
11 4s 2S 1/2 639.33918 639.57025 639.33120 639.63177 639.34918 639.3788
12 4d 2D3/2 639.52821 639.75043 639.52024 639.82629 639.53870 639.5682
13 4p 2P$^\circ$3/2 639.52831 639.75232 639.52059 639.82629 639.53894 639.5685
14 4d 2D5/2 639.59192 639.81378 639.58420 639.89008 639.60248 639.6321
15 4f 2F$^\circ$5/2 639.59206 639.81366 639.58408 639.89008 639.60248 639.6321
16 4f 2F$^\circ$7/2 639.62372 639.84534 639.61593 639.92188 639.63428 639.6639
17 5p 2P$^\circ$1/2 654.68953 654.91608 ..... 654.98773 654.70007 654.7303
18 5s 2S1/2 654.69234 654.92236 ..... 654.98773 654.70270 654.7330
19 5p 2P$^\circ$3/2 654.78903 655.01343 ..... 655.08722 654.79974 654.8300
20 5d 2D3/2 654.78903 655.01135 ..... 655.08722 654.79962 654.8298
21 5f 2F$^\circ$5/2 654.82173 655.04352 ..... 655.11993 654.83228 654.8625
22 5d 2D5/2 654.82156 655.04382 ..... 655.11993 654.83228 654.8625
23 5g 2G7/2 654.83802 655.05969 ..... 655.13617 654.84857 654.8788
24 5f 2F$^\circ$7/2 654.83787 655.05975 ..... 655.13617 654.84857 654.8788
25 5g 2G9/2 654.84778 655.06940 ..... 655.14594 654.85834 654.8885
NIST: http://physics.nist.gov/PhysRefData.
a Ballance et al. (2002);
b Kisielius et al. (1996);
c Coulomb energies;
d QED corrected energies;
e Energies calculated from the FAC code.

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