References for Fe XXI

.elvlc file (energy levels)

%energy levels (n=2, 26,27,28,30,31,32,35,36): Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy levels conf. 2s22p3d:  Mason et al., 1979, A&A, 73, 74
%observed energy levels configs. 4d,5d: Bromage, G.E., et al, 1977, Culham Lab. Report, CLM-R 170
%observed energy levels config 4s: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 67: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 56, 62: Kelly, 1987, J.Phys.Chem.Ref.Data, 16, Suppl.1 
%Comments:
   1 - The observed energies for 4d levels 42, 46 and 49 (1D2, 3D2, 3P2) have been interchanged to match theoretical energies:
                            42 --> 46
                            46 --> 49
                            49 --> 42
   2 - The observed energies for 5d levels 56 (1D2) and 65 (3P2) have been interchanged to match theoretical energies.
   3 - Level 67 (5d 1F3) was misidentified in Bromage et al, and its energy has been attributed to level 57 (5d 3F3).
%theoretical energy levels 2s22p2, 2s2p3, 2p4: Aggarwal, K.M., ApJSS, 1991, 77, 677
%theoretical energy levels 2s22p3s and 2s22p3d: Mason et al., 1979, A&A, 73, 74
%theoretical energy levels n=4,5: Phillips et al, 1996, ApJ, 466, 549 
% produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration
%
% E. Landi 2000

.splups file (collision data)

%collision strengths (from 2s22p2 to 2s22p3s and 2s22p3d): Mason et al., 1979, A&A, 73, 74
%effective collision strengths (2s22p2, 2s2p3, 2p4 configurations): Aggarwal, K.M., ApJSS, 1991, 77, 677
%Collision strengths n=4,5: Phillips et al, 1996, ApJ, 466, 549
%Oscillator strengths, A values n=4,5: Phillips et al, 1996, ApJ, 466, 549
% produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration
%
% E. Landi 2000 

.wgfa file (radiative data)

%energy levels (n=2, 26,27,28,30,31,32,35,36): Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy levels conf. 2s22p3d:  Mason et al., 1979, A&A, 73, 74
%observed energy levels configs. 4d,5d: Bromage, G.E., et al, 1977, Culham Lab. Report, CLM-R 170
%observed energy levels config 4s: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 67: Shirai,T., Sugar,J., Musgrove,A., Wiese,W.L., 2000, J.Phys.Chem.Ref.Data, Monograph 8
%observed energy level 56, 62: Kelly, 1987, J.Phys.Chem.Ref.Data, 16, Suppl.1
%Oscillator strengths, A values n=3: P.R.Young (DAMTP, Un. of Cambridge, UK), SUPERSTRUCTURE calculations, 1996
%Oscillator strengths, A values n=4,5: Phillips et al, 1996, ApJ, 466, 549
% produced as part of the Arcetri/Cambridge/NRL atomic data base collaboration
%
%E. Landi 2000