Table 4: Estimation of contribution spin-orbit (s-o), spin-other-orbit (s-o-o), spin-spin (s-s) and orbit-orbit (o-o) within shell interactions to energies for Fe XX levels within n=2 complex. $E_1=E^{{\rm s-o}}$, $E_2=E^{{\rm s-o}}+E^{{\rm s-o-o}}$, $E_3=E^{{\rm s-o}}+E^{{\rm s-o-o}}+E^{{\rm s-s}}$ and $E_4=E^{{\rm s-o}}+E^{{\rm s-o-o}}+E^{{\rm s-s}}+E^{{\rm o-o}}$.
Index E1 E2 E3 E4
2 141857 143122 143444 141910
3 182708 181082 181201 179270
4 264047 264411 264530 263975
5 327447 326489 326519 325670
6 755194 754560 754597 754662
7 821273 821367 821849 821936
8 843083 844242 843812 843945
9 1050595 1050928 1051144 1049976
10 1068168 1067125 1067206 1065988
11 1204074 1204221 1204372 1204963
12 1253448 1252420 1252540 1252569
13 1350217 1349293 1349347 1349601
14 1970331 1970400 1970517 1971268
15 2078969 2077652 2077773 2078527

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