\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}