Table 7: Sample set of fine strucuture levels of Fe XX and their relative energies for which forbidden transitions are considered. The configuration indices (Cf) correspond to $\rm 2s^22p^3$(1), $\rm 2s2p^4$(2), $\rm 2p^5$(3), $\rm 2s^22p^23s$(4), $\rm 2s^22p^23p$(5), $\rm 2s^22p^23d$(6), $\rm 2s2p^33s$(7), $\rm 2s2p^33p$(8), $\rm 2s2p^33d$(9).

ie		 SLp(cf) g k*cm E (Ry)

1		 4So( 1) 4 0 0.00000E+00
2 2Do( 1) 4 142375 1.29742E+00
3 2Do( 1) 6 180031 1.64057E+00
4 2Po( 1) 2 261233 2.38053E+00
5 2Po( 1) 4 322630 2.94002E+00
6 4Pe( 2) 6 753923 6.87025E+00
7 4Pe( 2) 4 820511 7.47704E+00
8 4Pe( 2) 2 842332 7.67589E+00
9 2De( 2) 4 1053027 9.59589E+00
10 2De( 2) 6 1068512 9.73700E+00
11 2Se( 2) 2 1203981 1.09715E+01
12 2Pe( 2) 4 1259046 1.14733E+01
13 2Pe( 2) 2 1352995 1.23294E+01
14 2Po( 3) 4 1972895 1.79783E+01
15 2Po( 3) 2 2078476 1.89405E+01
16 4Pe( 4) 2 7223242 6.58230E+01
17 4Pe( 4) 4 7282550 6.63635E+01
18 2Pe( 4) 2 7313778 6.66481E+01
19 4Pe( 4) 6 7323735 6.67388E+01
20 2Pe( 4) 4 7356044 6.70332E+01
21 4Do( 5) 2 7420827 6.76236E+01
22 2De( 4) 6 7456435 6.79480E+01
23 4Do( 5) 4 7461617 6.79953E+01
24 2De( 4) 4 7466086 6.80360E+01
25 4Po( 5) 2 7475943 6.81258E+01
26 2Do( 5) 4 7506494 6.84042E+01
27 4Do( 5) 6 7513283 6.84661E+01
28 2So( 5) 2 7526680 6.85882E+01
29 4Po( 5) 6 7534287 6.86575E+01
30 4Po( 5) 4 7546466 6.87685E+01
..........


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