Table 3a: Sample table of fine structure energy levels of Fe XX as sets of LS term components. $C_{\rm t}$ is the core configuration, $\nu$ is the effective quantum number.

$C_{\rm t}(S_{\rm t}L_{\rm t}\pi_{\rm t})$ $J_{\rm t}$ nl 2J E (Ry) $\nu$ $SL\pi$

Eqv electron/unidentified levels, parity: o

2s22p3 3 -1.15735E+02 4 S o

Nlv(c)=1 : set complete

Eqv electron/unidentified levels, parity: o

2s22p3 3 -1.14451E+02 2 D o

2s22p3 5 -1.14080E+02 2 D o

Nlv(c)=2 : set complete

Eqv electron/unidentified levels, parity: o

2s22p3 1 -1.13324E+02 2 P o

2s22p3 3 -1.12741E+02 2 P o

Nlv(c)=2 : set complete

Eqv electron/unidentified levels, parity: e

2s2p4 5 -1.08833E+02 4 P e

2s2p4 3 -1.08225E+02 4 P e

2s2p4 1 -1.08024E+02 4 P e

Nlv(c)=3 : set complete

Eqv electron/unidentified levels, parity: e

2s2p4 3 -1.06161E+02 2 D e

2s2p4 5 -1.06002E+02 2 D e

Nlv(c)=2 : set complete

Eqv electron/unidentified levels, parity: e

2s2p4 1 -1.04752E+02 2 S e

Nlv(c)=1 : set complete

Eqv electron/unidentified levels, parity: e

2s2p4 3 -1.04314E+02 2 P e

2s2p4 1 -1.03421E+02 2 P e

Nlv(c)=2 : set complete

Nlv=3,  ⁴L^e: P ( 5 3 1 )/2

2s22p2 (3Pe) 1 3s 1 -5.04616E+01 2.80 4 P e

2s22p2 (3Pe) 1 3s 3 -4.98576E+01 2.81 4 P e

2s22p2 (3Pe) 2 3s 5 -4.94420E+01 2.81 4 P e

Nlv(c)=3 : set complete

Nlv=2,  ²L^e: P ( 3 1 )/2

2s22p2 (3Pe) 0 3s 1 -4.95776E+01 2.84 2 P e

2s22p2 (3Pe) 2 3s 3 -4.81072E+01 2.85 2 P e

Nlv(c)=2 : set complete

Nlv=2,  ²L^e: D ( 5 3 )/2

2s22p2 (1De) 2 3s 3 -4.91520E+01 2.79 2 D e

2s22p2 (1De) 2 3s 5 -4.81968E+01 2.82 2 D e

Nlv(c)=2 : set complete

Nlv=8,  ⁴L^o: S ( 3 )/2 P ( 5 3 1 )/2 D ( 7 5 3 1 )/2

2s22p2 (3Pe) 1 3p 1 -4.86256E+01 2.85 4 PD o

2s22p2 (3Pe) 1 3p 3 -4.82304E+01 2.86 4 SPD o

2s22p2 (3Pe) 0 3p 1 -4.80568E+01 2.88 4 PD o

2s22p2 (3Pe) 2 3p 3 -4.77760E+01 2.86 4 SPD o

2s22p2 (3Pe) 2 3p 5 -4.76976E+01 2.86 4 PD o

2s22p2 (3Pe) 2 3p 5 -4.74888E+01 2.87 4 PD o

2s22p2 (3Pe) 1 3p 3 -4.73964E+01 2.88 4 SPD o

2s22p2 (3Pe) 2 3p 7 -4.72804E+01 2.88 4 D o

Nlv(c)= 8 : set complete

**Table 3a:** Sample table of fine structure energy levels of Fe XX as sets of LS term components. $C_{\rm t}$ is the core configuration, $\nu$ is the effective quantum number.
$C_{\rm t}(S_{\rm t}L_{\rm t}\pi_{\rm t})$	$J_{\rm t}$	nl	2J	E (Ry)	$\nu$	$SL\pi$
Eqv electron/unidentified levels, parity: o
2s22p3				3	-1.15735E+02		4 S o
Nlv(c)=1 : set complete
Eqv electron/unidentified levels, parity: o
2s22p3				3	-1.14451E+02		2 D o
2s22p3				5	-1.14080E+02		2 D o
Nlv(c)=2 : set complete
Eqv electron/unidentified levels, parity: o
2s22p3				1	-1.13324E+02		2 P o
2s22p3				3	-1.12741E+02		2 P o
Nlv(c)=2 : set complete
Eqv electron/unidentified levels, parity: e
2s2p4				5	-1.08833E+02		4 P e
2s2p4				3	-1.08225E+02		4 P e
2s2p4				1	-1.08024E+02		4 P e
Nlv(c)=3 : set complete
Eqv electron/unidentified levels, parity: e
2s2p4				3	-1.06161E+02		2 D e
2s2p4				5	-1.06002E+02		2 D e
Nlv(c)=2 : set complete
Eqv electron/unidentified levels, parity: e
2s2p4				1	-1.04752E+02		2 S e
Nlv(c)=1 : set complete
Eqv electron/unidentified levels, parity: e
2s2p4				3	-1.04314E+02		2 P e
2s2p4				1	-1.03421E+02		2 P e
Nlv(c)=2 : set complete
Nlv=3, ⁴L^e: P ( 5 3 1 )/2
2s22p2	(3Pe)	1	3s	1	-5.04616E+01	2.80	4 P e
2s22p2	(3Pe)	1	3s	3	-4.98576E+01	2.81	4 P e
2s22p2	(3Pe)	2	3s	5	-4.94420E+01	2.81	4 P e
Nlv(c)=3 : set complete
Nlv=2, ²L^e: P ( 3 1 )/2
2s22p2	(3Pe)	0	3s	1	-4.95776E+01	2.84	2 P e
2s22p2	(3Pe)	2	3s	3	-4.81072E+01	2.85	2 P e
Nlv(c)=2 : set complete
Nlv=2, ²L^e: D ( 5 3 )/2
2s22p2	(1De)	2	3s	3	-4.91520E+01	2.79	2 D e
2s22p2	(1De)	2	3s	5	-4.81968E+01	2.82	2 D e
Nlv(c)=2 : set complete
Nlv=8, ⁴L^o: S ( 3 )/2 P ( 5 3 1 )/2 D ( 7 5 3 1 )/2
2s22p2	(3Pe)	1	3p	1	-4.86256E+01	2.85	4 PD o
2s22p2	(3Pe)	1	3p	3	-4.82304E+01	2.86	4 SPD o
2s22p2	(3Pe)	0	3p	1	-4.80568E+01	2.88	4 PD o
2s22p2	(3Pe)	2	3p	3	-4.77760E+01	2.86	4 SPD o
2s22p2	(3Pe)	2	3p	5	-4.76976E+01	2.86	4 PD o
2s22p2	(3Pe)	2	3p	5	-4.74888E+01	2.87	4 PD o
2s22p2	(3Pe)	1	3p	3	-4.73964E+01	2.88	4 SPD o
2s22p2	(3Pe)	2	3p	7	-4.72804E+01	2.88	4 D o
Nlv(c)= 8 : set complete

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