Table 8: Line strength (S) and A-coefficients for the forbidden electric quadrupole (E2) and octupole (E3), and magnetic dipole (M1) transitions in Fe XX. The level numbers (i, j) and configurations indices (C_i and C_j) correspond to those in Table 7, such as $\rm 2s^22p^3$ (1), $\rm 2s2p^4$ (2), $\rm 2p^5$ (3), $\rm 2s^22p^23s$ (4), $\rm 2s^22p^23p$ (5), etc.

i j $SL\pi$ $SL\pi$ g_i g_j $\lambda~(\AA)$ SE2 AE2 SM1 AM1

:C_i :C_j s^-1 s^-1

E2 and M1

2 1 4So:1 2Do:1 4 4 721.40 3.31E-04 7.11E-01 7.98E-01 1.43E+04

3 1 4So:1 2Do:1 4 6 567.77 6.92E-04 3.28E+00 4.55E-02 1.12E+03

3 2 2Do:1 2Do:1 4 6 2666.08 1.37E-03 2.84E-03 1.78E+00 4.22E+02

4 1 4So:1 2Po:1 4 2 384.21 6.35E-05 6.37E+00 1.25E-01 2.97E+04

4 2 2Do:1 2Po:1 4 2 822.00 2.41E-03 5.40E+00 2.50E-01 6.06E+03

4 3 2Do:1 2Po:1 6 2 1188.40 2.13E-03 7.55E-01 0.00E+00 0.00E+00

5 1 4So:1 2Po:1 4 4 309.27 4.45E-06 6.60E-01 1.28E-01 2.91E+04

5 2 2Do:1 2Po:1 4 4 541.36 8.13E-04 7.34E+00 1.02E+00 4.34E+04

5 3 2Do:1 2Po:1 6 4 679.29 5.30E-03 1.54E+01 5.74E-01 1.24E+04

5 4 2Po:1 2Po:1 2 4 1585.64 6.99E-04 2.93E-02 9.59E-01 1.62E+03

7 6 4Pe:2 4Pe:2 6 4 1468.60 2.15E-03 1.32E-01 3.54E+00 7.54E+03

8 6 4Pe:2 4Pe:2 6 2 1116.08 1.73E-03 8.39E-01 0.00E+00 0.00E+00

8 7 4Pe:2 4Pe:2 4 2 4649.52 2.07E-04 7.99E-05 3.13E+00 4.20E+02

9 6 4Pe:2 2De:2 6 4 345.02 1.35E-04 1.16E+01 8.39E-04 1.38E+02

9 7 4Pe:2 2De:2 4 4 450.97 1.32E-06 2.98E-02 1.45E-01 1.07E+04

9 8 4Pe:2 2De:2 2 4 499.40 9.50E-05 1.28E+00 4.15E-02 2.25E+03

E3

i j $SL\pi$ $SL\pi$ g_i g_j $\lambda~(\AA)$ SE3 AE3

:C_i :C_j s^-1

6 4 4Pe:2 2Po:1 6 2 203.06 4.17E-06 3.07E-05

8 3 4Pe:2 2Do:1 2 6 150.10 2.91E-08 5.33E-06

10 4 2De:2 2Po:1 6 2 125.30 1.41E-04 3.05E-02

11 3 2Se:2 2Do:1 2 6 98.12 1.49E-04 5.35E-01

13 3 2Pe:2 2Do:1 2 6 85.92 5.42E-04 4.93E+00

15 6 2Po:3 4Pe:2 2 6 76.37 1.59E-05 3.30E-01

15 10 2Po:3 2De:2 2 6 99.62 5.72E-04 1.85E+00

16 3 4Pe:4 2Do:1 2 6 14.25 1.23E-04 3.24E+05

18 3 2Pe:4 2Do:1 2 6 14.01 9.42E-04 2.80E+06

19 4 4Pe:4 2Po:1 6 2 14.21 8.80E-05 7.89E+04

19 15 4Pe:4 2Po:3 6 2 19.10 1.50E-06 1.70E+02

21 6 4Do:5 4Pe:2 2 6 15.00 1.98E-06 3.65E+03

**Table 8:** Line strength (S) and A-coefficients for the forbidden electric quadrupole (E2) and octupole (E3), and magnetic dipole (M1) transitions in Fe XX. The level numbers (i, j) and configurations indices (C_i and C_j) correspond to those in Table 7, such as $\rm 2s^22p^3$ (1), $\rm 2s2p^4$ (2), $\rm 2p^5$ (3), $\rm 2s^22p^23s$ (4), $\rm 2s^22p^23p$ (5), etc.
i	j	$SL\pi$	$SL\pi$	g_i	g_j	$\lambda~(\AA)$	SE2	AE2	SM1	AM1
		:C_i	:C_j					s^-1		s^-1
E2 and M1
2	1	4So:1	2Do:1	4	4	721.40	3.31E-04	7.11E-01	7.98E-01	1.43E+04
3	1	4So:1	2Do:1	4	6	567.77	6.92E-04	3.28E+00	4.55E-02	1.12E+03
3	2	2Do:1	2Do:1	4	6	2666.08	1.37E-03	2.84E-03	1.78E+00	4.22E+02
4	1	4So:1	2Po:1	4	2	384.21	6.35E-05	6.37E+00	1.25E-01	2.97E+04
4	2	2Do:1	2Po:1	4	2	822.00	2.41E-03	5.40E+00	2.50E-01	6.06E+03
4	3	2Do:1	2Po:1	6	2	1188.40	2.13E-03	7.55E-01	0.00E+00	0.00E+00
5	1	4So:1	2Po:1	4	4	309.27	4.45E-06	6.60E-01	1.28E-01	2.91E+04
5	2	2Do:1	2Po:1	4	4	541.36	8.13E-04	7.34E+00	1.02E+00	4.34E+04
5	3	2Do:1	2Po:1	6	4	679.29	5.30E-03	1.54E+01	5.74E-01	1.24E+04
5	4	2Po:1	2Po:1	2	4	1585.64	6.99E-04	2.93E-02	9.59E-01	1.62E+03
7	6	4Pe:2	4Pe:2	6	4	1468.60	2.15E-03	1.32E-01	3.54E+00	7.54E+03
8	6	4Pe:2	4Pe:2	6	2	1116.08	1.73E-03	8.39E-01	0.00E+00	0.00E+00
8	7	4Pe:2	4Pe:2	4	2	4649.52	2.07E-04	7.99E-05	3.13E+00	4.20E+02
9	6	4Pe:2	2De:2	6	4	345.02	1.35E-04	1.16E+01	8.39E-04	1.38E+02
9	7	4Pe:2	2De:2	4	4	450.97	1.32E-06	2.98E-02	1.45E-01	1.07E+04
9	8	4Pe:2	2De:2	2	4	499.40	9.50E-05	1.28E+00	4.15E-02	2.25E+03
E3
i	j	$SL\pi$	$SL\pi$	g_i	g_j	$\lambda~(\AA)$	SE3	AE3
		:C_i	:C_j					s^-1
6	4	4Pe:2	2Po:1	6	2	203.06	4.17E-06	3.07E-05
8	3	4Pe:2	2Do:1	2	6	150.10	2.91E-08	5.33E-06
10	4	2De:2	2Po:1	6	2	125.30	1.41E-04	3.05E-02
11	3	2Se:2	2Do:1	2	6	98.12	1.49E-04	5.35E-01
13	3	2Pe:2	2Do:1	2	6	85.92	5.42E-04	4.93E+00
15	6	2Po:3	4Pe:2	2	6	76.37	1.59E-05	3.30E-01
15	10	2Po:3	2De:2	2	6	99.62	5.72E-04	1.85E+00
16	3	4Pe:4	2Do:1	2	6	14.25	1.23E-04	3.24E+05
18	3	2Pe:4	2Do:1	2	6	14.01	9.42E-04	2.80E+06
19	4	4Pe:4	2Po:1	6	2	14.21	8.80E-05	7.89E+04
19	15	4Pe:4	2Po:3	6	2	19.10	1.50E-06	1.70E+02
21	6	4Do:5	4Pe:2	2	6	15.00	1.98E-06	3.65E+03

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