\begin{table}%t8 %\centering \par \caption{\label{tab_energy_fe}The level energies (Ryd) of Fe$^{16+}$ from different calculations along with the compilation of NIST v3.} \begin{tabular}{cccccccc} \hline\hline\noalign{\smallskip} ID & Level~specification & NIST\tablefootmark{a} & AS & FAC & MCDF\tablefootmark{b} & CHIANTI\tablefootmark{c} & LPB06\tablefootmark{d}\\ \hline\noalign{\smallskip} 1 & ${\rm 2s^2 2p^6 ~ ^1S_0}$ & & & & & & \\ 2 & ${\rm 2s^2 2p^5 3s ~ ^3P_2}$ & 53.3045 & 53.3307 & 53.3312 & 53.1706 & 53.2094 & 53.2031 \\ 3 & ${\rm 2s^2 2p^5 3s ~ ^1P_1}$ & 53.4437 & 53.4689 & 53.4779 & 53.3143 & 53.3568 & 53.3448 \\ 4 & ${\rm 2s^2 2p^5 3s ~ ^3P_0}$ & 54.2314 & 54.2578 & 54.2560 & 54.0986 & 54.1357 & 54.1517 \\ 5 & ${\rm 2s^2 2p^5 3s ~ ^3P_1}$ & 54.3194 & 54.3462 & 54.3496 & 54.1897 & 54.2300 & 54.2431 \\ 6 & ${\rm 2s^2 2p^5 3p ~ ^3S_1}$ & 55.5276 & 55.5708 & 55.5563 & 55.3951 & 55.4308 & 55.4328 \\ 7 & ${\rm 2s^2 2p^5 3p ~ ^3D_2}$ & 55.7849 & 55.8376 & 55.8272 & 55.6636 & 55.7067 & 55.6964 \\ 8 & ${\rm 2s^2 2p^5 3p ~ ^3D_3}$ & 55.9038 & 55.9520 & 55.9426 & 55.7804 & 55.8246 & 55.8201 \\ 9 & ${\rm 2s^2 2p^5 3p ~ ^1P_1}$ & 55.9869 & 56.0364 & 56.0320 & 55.8682 & 55.9135 & 55.9022 \\ 10 & ${\rm 2s^2 2p^5 3p ~ ^3P_2}$ & 56.1201 & 56.1639 & 56.1619 & 55.9989 & 56.0474 & 56.0335 \\ 11 & ${\rm 2s^2 2p^5 3p ~ ^3P_0}$ & 56.5191 & 56.5849 & 56.5719 & 56.4098 & 56.4579 & 56.4508 \\ 12 & ${\rm 2s^2 2p^5 3p ~ ^3D_1}$ & 56.6718 & 56.7311 & 56.7111 & 56.5526 & 56.6006 & 56.6084 \\ 13 & ${\rm 2s^2 2p^5 3p ~ ^3P_1}$ & 56.9105 & 56.9573 & 56.9494 & 56.7885 & 56.8289 & 56.8445 \\ 14 & ${\rm 2s^2 2p^5 3p ~ ^1D_2}$ & 56.9383 & 56.9872 & 56.9778 & 56.8171 & 56.8582 & 56.8772 \\ 15 & ${\rm 2s^2 2p^5 3p ~ ^1S_0}$ & 57.8965 & 58.0542 & 58.1335 & 57.9419 & 57.9776 & 57.9856 \\ 16 & ${\rm 2s^2 2p^5 3d ~ ^3P_0}$ & 58.9041 & 58.9616 & 58.9393 & 58.7755 & 58.8068 & 58.8127 \\ 17 & ${\rm 2s^2 2p^5 3d ~ ^3P_1}$ & 58.9754 & 59.0393 & 59.0102 & 58.8470 & 58.8790 & 58.8896 \\ 18 & ${\rm 2s^2 2p^5 3d ~ ^3P_2}$ & 59.1084 & 59.1836 & 59.1458 & 58.9838 & 59.0170 & 59.0303 \\ 19 & ${\rm 2s^2 2p^5 3d ~ ^3F_4}$ & 59.1123 & 59.1979 & 59.1518 & 58.9913 & 59.0242 & 59.0417 \\ 20 & ${\rm 2s^2 2p^5 3d ~ ^3F_3}$ & 59.1688 & 59.2402 & 59.2122 & 59.0521 & 59.0874 & 59.0991 \\ 21 & ${\rm 2s^2 2p^5 3d ~ ^1D_2}$ & 59.2934 & 59.3676 & 59.3423 & 59.1821 & 59.2187 & 59.2247 \\ 22 & ${\rm 2s^2 2p^5 3d ~ ^3D_3}$ & 59.3722 & 59.4603 & 59.4210 & 59.2625 & 59.3014 & 59.3077 \\ 23 & ${\rm 2s^2 2p^5 3d ~ ^3D_1}$ & 59.7080 & 59.8023 & 59.7720 & 59.6131 & 59.6558 & 59.6588 \\ 24 & ${\rm 2s^2 2p^5 3d ~ ^3F_2}$ & 60.0922 & 60.1639 & 60.1337 & 59.9778 & 60.0127 & 60.0446 \\ 25 & ${\rm 2s^2 2p^5 3d ~ ^3D_2}$ & 60.1523 & 60.2362 & 60.1962 & 60.0370 & 60.0718 & 60.1031 \\ 26 & ${\rm 2s^2 2p^5 3d ~ ^1F_3}$ & 60.1906 & 60.2777 & 60.2357 & 60.0784 & 60.1136 & 60.1476 \\ 27 & ${\rm 2s^2 2p^5 3d ~ ^1P_1}$ & 60.6904 & 60.8214 & 60.7903 & 60.6368 & 60.6927 & 60.6979 \\ 28 & ${\rm 2s 2p^6 3s ~ ^3S_1}$ & & 63.3645 & 63.3648 & 63.2124 & 63.2696 & 63.2710 \\ 29 & ${\rm 2s 2p^6 3s ~ ^1S_0}$ & 63.8798 & 63.8515 & 63.8514 & 63.6988 & 63.7498 & 63.7572 \\ 30 & ${\rm 2s 2p^6 3p ~ ^3P_0}$ & & 65.7796 & 65.7877 & 65.6342 & 65.6924 & 65.6910 \\ 31 & ${\rm 2s 2p^6 3p ~ ^3P_1}$ & 65.6012 & 65.8153 & 65.8214 & 65.6674 & 65.7260 & 65.7266 \\ 32 & ${\rm 2s 2p^6 3p ~ ^3P_2}$ & & 65.9876 & 65.9901 & 65.8373 & 65.8944 & 65.9017 \\ 33 & ${\rm 2s 2p^6 3p ~ ^1P_1}$ & 65.9238 & 66.1298 & 66.1379 & 65.9800 & 66.0421 & 66.0427 \\ 34 & ${\rm 2s 2p^6 3d ~ ^3D_1}$ & & 69.0895 & 69.0653 & 68.9199 & 68.9602 & 68.9884 \\ 35 & ${\rm 2s 2p^6 3d ~ ^3D_2}$ & & 69.1085 & 69.0752 & 68.9299 & 68.9704 & 69.0021 \\ 36 & ${\rm 2s 2p^6 3d ~ ^3D_3}$ & & 69.1411 & 69.0942 & 68.9492 & 68.9891 & 69.0244 \\ 37 & ${\rm 2s 2p^6 3d ~ ^1D_2}$ & & 69.4869 & 69.4588 & 69.3246 & 69.3763 & 69.3962 \\ 38 & ${\rm 2s^2 2p^5 4s ~ ^3P_2}$ & 71.7987 & 71.8811 & 71.8355 & 71.6597 & 71.6171 & 71.6967 \\ 39 & ${\rm 2s^2 2p^5 4s ~ ^1P_1}$ & 71.8607 & 71.9220 & 71.8848 & 71.7069 & 71.6641 & 71.7432 \\ 40 & ${\rm 2s^2 2p^5 4p ~ ^3S_1}$ & & 72.7994 & 72.7615 & 72.5911 & 72.5318 & 72.6254 \\ 41 & ${\rm 2s^2 2p^5 4s ~ ^3P_0}$ & & 72.8081 & 72.7629 & 72.5874 & 72.5469 & 72.6500 \\ 42 & ${\rm 2s^2 2p^5 4s ~ ^3P_1}$ & 72.7464 & 72.8295 & 72.7883 & 72.6153 & 72.5710 & 72.6746 \\ 43 & ${\rm 2s^2 2p^5 4p ~ ^3D_2}$ & & 72.8634 & 72.8319 & 72.6530 & 72.6004 & 72.6897 \\ 44 & ${\rm 2s^2 2p^5 4p ~ ^3D_3}$ & & 72.9087 & 72.8792 & 72.7022 & 72.6435 & 72.7416 \\ 45 & ${\rm 2s^2 2p^5 4p ~ ^1P_1}$ & & 72.9373 & 72.9115 & 72.7323 & 72.6753 & 72.7699 \\ 46 & ${\rm 2s^2 2p^5 4p ~ ^3P_2}$ & & 72.9786 & 72.9557 & 72.7756 & 72.7170 & 72.8132 \\ 47 & ${\rm 2s^2 2p^5 4p ~ ^3P_0}$ & & 73.2551 & 73.2511 & 73.0634 & 72.9940 & 73.1028 \\ 48 & ${\rm 2s^2 2p^5 4p ~ ^3D_1}$ & & 73.7730 & 73.7383 & 73.5649 & 73.5003 & 73.6243 \\ 49 & ${\rm 2s^2 2p^5 4p ~ ^3P_1}$ & & 73.8526 & 73.8255 & 73.6515 & 73.5963 & 73.7118 \\ 50 & ${\rm 2s^2 2p^5 4p ~ ^1D_2}$ & & 73.8697 & 73.8431 & 73.6682 & 73.6135 & 73.7296 \\ 51 & ${\rm 2s^2 2p^5 4d ~ ^3P_0}$ & & 74.0252 & 73.9790 & 73.8125 & 73.7417 & 73.8512 \\ 52 & ${\rm 2s^2 2p^5 4d ~ ^3P_1}$ & 73.9584 & 74.0590 & 74.0119 & 73.8449 & 73.7727 & 73.8853 \\ 53 & ${\rm 2s^2 2p^5 4d ~ ^3F_4}$ & 74.0277 & 74.1043 & 74.1091 & 73.8853 & 73.8308 & 73.9701 \\ 54 & ${\rm 2s^2 2p^5 4p ~ ^1S_0}$ & & 74.0833 & 74.0531 & 73.9148 & 73.8083 & 73.9491 \\ 55 & ${\rm 2s^2 2p^5 4d ~ ^3P_2}$ & & 74.1140 & 74.0660 & 73.8982 & 73.8224 & 73.9396 \\ 56 & ${\rm 2s^2 2p^5 4d ~ ^3F_3}$ & & 74.1195 & 74.0767 & 73.9075 & 73.8364 & 73.9283 \\ 57 & ${\rm 2s^2 2p^5 4d ~ ^1D_2}$ & 74.2838 & 74.1644 & 74.1236 & 73.9538 & 73.8813 & 73.9939 \\ 58 & ${\rm 2s^2 2p^5 4d ~ ^3D_3}$ & 74.0477 & 74.1970 & 74.1519 & 73.9819 & 73.9044 & 74.0231 \\ 59 & ${\rm 2s^2 2p^5 4d ~ ^3D_1}$ & 74.3047 & 74.3832 & 74.3478 & 74.1765 & 74.0944 & 74.2181 \\ 60 & ${\rm 2s^2 2p^5 4f ~ ^3D_1}$ & & 74.6746 & 74.6503 & 74.4623 & 74.4692 & 74.5017 \\ \hline \end{tabular} \tablefoot{\tablefootmark{a}{Sources of the NIST v3 are from the work of %Sugar \& Corliss ( \citet{SC85} and references therein.} \tablefootmark{b}{MCDF data from the work of Aggarwal et~al. (2004).} \tablefootmark{c}{Data in CHIANTI are from the work of %Landi \& Gu %(2009)% \citet{LG06}%BLS09} .} \tablefootmark{d}{LPB06 corresponds to the work of %Loch et~al. ( \citet{LPB06}.}} \end{table}