\begin{table}

\caption {\label{cno_table} Equivalent width of the CNO emission lines in 
HD~45166 obtained from the observations. References: Willis \& Stickland (1983) for ultraviolet lines (1200--3300~{\AA}), and this work for optical lines (3700--9000~{\AA}).
Key: $y=line$ is present; $y?=\rm doubtful$
identification due to low S/N; ?\,=\,doubtful identification due to presence of a
telluric line; bl\,=\,blended with other lines; n=line is definitely not present.} 
\begin{tabular}{c c c c c c c c}
\hline\hline
& & \multicolumn{2}{c}{O} &\multicolumn{2}{c}{N} & \multicolumn{2}{c}{C}\\
\cline{3-4} \cline{5-6} \cline{7-8}  
&&&&\\[-3mm]
Term & $J-J$ &	$\lambda$ ({\AA})	& $W_{\lambda }$ ({\AA})&	$\lambda$ ({\AA})	& $W_{\lambda }$ ({\AA})&	$\lambda$ ({\AA})	& $W_{\lambda }$ ({\AA})\\
\hline
& & \multicolumn{2}{c}{\ion{O}{iii}} & & & & \\
\hline
\multicolumn{2}{c}{IP(eV)}&\multicolumn{2}{c}{54.94} & &  & &\\					
\multicolumn{2}{c}{{\it Singlets}}&  & &&&&\\
1P$^0$--1S              &       1--0     &	1247  & ?       & & & &\\
3s 1P$^0$--3p 1P	&	1--1	&	5592  &	0.75	& & & & \\
3p 1D--3d 1F$^0$	&	2--3	&	3962  &	0.29    & & & & \\
4p 1S--5s1P$^0$	&	0--1	&	5268  &	0.13    & & & & \\
4p 1D--5s 1P$^0$ 	&		&	4569  &	0.05    & & & & \\
3s 1P$^0$--3p 1D	&		&	2984  &	0.88?   & & & & \\

\multicolumn{2}{c}{{\it Triplets}}&  & &&&&\\
3P$^0$--3P      &      		&       1175  & 1.86 ? & & & & \\
3s 3P$^0$--3p 3D&       2--3	&	3760  &	1.4    & & & & \\
	        &       1--2	&	3755  &	0.99   & & & & \\
		&       0--1	&	3757  & 1.1    & & & & \\	
		&       2--2	&	3791  & \ldots	       & & & & \\	
	        &       1--1	&	3774  &	\ldots       & & & & \\	
3p 3P--3d 3D$^0$&	2--3	&	3715  &	0.99   & & & & \\
  		&       1--2	&	3707  & 0.35   & & & & \\	
		&       1--1	&	3703  & \ldots       & & & & \\
3s 3P--3p 3D$^0$& 	2--3	& 	4081  & 0.12   & & & & \\
		& 		& 	4074  & \ldots       & & & & \\
4d 3P$^0$--3s 3D&	1--2	&	7455  & 0.08   & & & & \\
		&		&	7475  &\ldots        & & & & \\
		&		&	7482  & \ldots       & & & & \\
		&		&	7492  & \ldots       & & & & \\
\hline
& & \multicolumn{2}{c}{\ion{O}{iv}} & \multicolumn{2}{c}{\ion{N}{iii}} & & \\
\hline
\multicolumn{2}{c}{IP(eV)}&\multicolumn{2}{c}{77.41} & \multicolumn{2}{c}{47.45}& &\\					

2p2 2P--2p3 2Do  &	 3/2--5/2    &	  1344  & \ldots	  &	    1752  &  \ldots       &   & \\
  	        &	  1/2--3/2   &    1339  &  1.82   &	    1748  & \ldots	   &   & \\
	   	&	  3/2--3/2   &	  1343  &  0.92   &	    1751  & \ldots	   &   & \\
3s 2S--3p 2P$^0$    &	  1/2--3/2   &	  3063  & \ldots	  &	    4097  &  1.66  &   & \\
 	        &	  1/2--1/2   &	  3072  & \ldots	  &	    4103  &  0.84  &   & \\
3s 2P$^0$--3p 2D    &	 3/2--5/2    &	  3349  & \ldots	  &	    4200  &  0.77  &   & \\
         	&	  1/2--3/2   &	  3348  & \ldots	  &	    4196  &  0.16  &   & \\	 
	  	&	 3/2--3/2    &	  3378  & \ldots	  &	    4216  & \ldots	   &   & \\
 3p 2P--3d 2P$^0$   &	 3/2--3/2    &	  2133  & \ldots	  &	    2984  &  0.88  &   & \\
		&	  1/2--3/2   &	  2127  & \ldots	  &	    2979  & \ldots	   &   & \\
		&	 3/2--1/2    &	  2126  & \ldots	  &	    2977  & \ldots	   &   & \\
                &	  1/2--1/2   &	  2120  & \ldots	  &	    2973  & \ldots	   &   & \\
3p 2P$^0$--3d 2D    &	 3/2--5/2    &	  3412  & \ldots	  &	    4641  &  1.37  &   & \\
 	        &	  1/2--3/2   &	  3404  & \ldots	  &	    4634  &  0.75  &   & \\	
  		&	 3/2--3/2    &	  3414  & \ldots	  &	    4642  &	?  &   & \\
4d 2D--5f 2F$^0$	&	 5/2--7/2    &	  3563  &\ldots	  &	    4004  &  0.07  &   & \\
            		&	 3/2--5/2    &	  3560  &\ldots	  &	    3999  & \ldots	   &   & \\
4f 2F$^0$--5g 2G	&		     &	 	&	  &	    4379  &  0.56  &   & \\
3d 2P$^0$--6d 2D	&		     &	 	&	  &	    8494  &  y	   &   & \\
5f 2F$^0$--6g 2G	&		     &	 	&	  &	    8019  &  0.54  &   & \\
3s 4P$^0$--3p 4D   &	 5/2--7/2    &	  3386  &\ldots	  &	    4515  &  0.19: &   & \\
	 	&	 1/2--3/2    &	  3381  &\ldots	  &	    4511  &  0.21  &   & \\
3p 4D--3d 4F$^0$   &	 7/2--9/2    &	  3737  &\ldots	  &	    4867  &  0.20  &   & \\
	     	&	 5/2--7/2    &	  3729  &\ldots	  &	    4861  &\ldots	   &   & \\
		&	 3/2--5/2    &	  3725  &\ldots	  &	    4859  &\ldots	   &   & \\
\hline	
& & \multicolumn{2}{c}{\ion{O}{v}} & \multicolumn{2}{c}{\ion{N}{iv}} & \multicolumn{2}{c}{\ion{C}{iii}} \\
\hline		
\multicolumn{2}{c}{IP(eV)}&\multicolumn{2}{c}{113.90} & \multicolumn{2}{c}{77.47}&\multicolumn{2}{c}{47.89} \\							
\multicolumn{2}{c}{{\it Singlets}}&  & &&&&\\
2p 1P$^0$--2p2 1D	 &	  1--2	 &	    1371  &   2.71 &		1719 &    4.97  &    2297  &   1.88   \\
\hline
2p 1P$^0$--2p2 1S	 &	  1--0	 &	    774   &\ldots	   &		955  &	\ldots        &    1247  &   y      \\
3s 1S--3s 1P$^0$	 &	  0--1	 &		  &	   &		1188 &    0.19  &    1591  &	\ldots      \\
3s 1S--3p 1P$^0$	 &	  0--1	 &	    5114  &   y?   &	  	6381 &    0.21: &    8500  &   y      \\
3p 1P$^0$--3d 1D	 &	  1--2	 &	    3145  &\ldots	   &		4058 &    1.11  &    5695  &   0.096  \\
3d 1D--3s 1P$^0$	 &		 &		  &	   &		2279 &  \ldots        &    2982  &   y?     \\
3d 1D--3d 1F$^0$	 &	  2--3	 &		  &	   &		1310 &    0.26  &    1541  &\ldots	      \\
3d 1D--5f 1F$^0$	 &	  2--3	 &	    509   &\ldots	   &		1297 &    y?    &    1382  &\ldots	      \\
4p 1P$^0$--5d 1D	 &	  1--	 &	    1419  &   0.30 &		     &	        &  	   &	      \\
4f 1F$^0$--5g 1G 	 &	  3--4	 &	    1708  &\ldots	   &		3078 &  \ldots        &    4187  &   0.127  \\
\multicolumn{2}{c}{{\it Intercombination}}&  & &&&&\\
2s2 1S--2p 3P$^0$   &	0--	 &	    1218 &\ldots	  &		1486 &	0.11	&	1909&	n      \\
\multicolumn{2}{c}{{\it Triplets}}&  & &&&&\\
2p 3P$^0$--2p2 3P	 &	 1--0	&	  759	&\ldots	    &	    923  &\ldots		 &    1175 &   1.86    \\
			 &	 	&	  759	&\ldots	    &	 	 &	 	 &    1172 &	\ldots       \\
3s 3S--3p 3P$^0$	 &	 1--2	&	  2781  &\ldots	    &	    3479 &\ldots	 	 &    4647 &   2.38    \\
		 	 &	 1--1	&	  2787  &\ldots	    &	    3482 &\ldots	 	 &    4650 &   1.46    \\
			 &	 1--0	&	  2790  &\ldots	    &	    3484 &\ldots	 	 &    4651 &   0.42:   \\
3s 3P$^0$--3p 3P	 &	 2--2	&	  2731  &\ldots	    &	    3463 &   y  	 &    4666 &   y       \\
			 &	 	&	  2744  &\ldots	    &	    3461 &   y  	 &    4673 &   ?       \\
			 &	 	&	  2729  &\ldots	    &	    3475 &   y  	 &    4663 &   ?       \\
3s 3P$^0$--3p 3D	 &	 2--3	&	  4124  &\ldots	    &	    5204 &   y  	 &    6744 &   0.17    \\
			 &	 	&	  4120  &\ldots	    &	    5200 &   y  	 &    6731 &   0.077:  \\
			 &	 	&	  4125  &\ldots	    &	    5205 &   y? 	 &    6727 &\ldots	       \\
3p 3P$^0$--3p 3D	 &	 	&	  1055  &\ldots	    &	    1272 &   0.92	 &    1578 &\ldots	       \\
		 	&	 	&	  1058	&\ldots	    &		 &		 &	   &	       \\
		 	&	 	&	  1059	&\ldots	    &		 &		 &	   &	       \\
		 	&	 	&	  1060	&\ldots	    &		 &		 &	   &	       \\
		 	&	 	&	  1061	&\ldots	    &		 &		 &	   &	       \\
3p 3P$^0$--3d 3D	 &	 2--3	&	  5598  &  n	    &	    7123 &   3.31	 &    9715 &\ldots	       \\
			 &	 1--2	&	  5580  &\ldots	    &	    7109 &   1.91:	 &    9705 &\ldots	       \\
		 	&	 0--1	&	  5573  &\ldots	    &	    7103 &   0.92	 &    9701 &\ldots	       \\
		 	&	 2--2	&	  5604  &\ldots	    &	    7127 &   0.70:	 &    9718 & \ldots          \\
		 	&	 1--1	&	  5583  &\ldots	    &	    7111 &   y  	 &    9706 &\ldots	       \\
		 	&	 2--1	&	  5607  &\ldots	    &	    7129 &\ldots	 	 &    9719 &\ldots	       \\
3d 3D--3d 3F$^0$	 &	 	&		&	    &	    1326 &   0.14    	 &	   &	       \\
3d 3D--5f 3F$^0$	 &	 	&		&	    &	 	 &	 	 &    1296 &\ldots	       \\
4s 3S--4p 3P$^0$	 &	 1--2	&	  7437  &  n	    &	    6220 &   y  	 &    7796 &   n       \\
			 &	 1--1	&	  7443  &  n	    &	    6215 &   y  	 &    7780 &   n       \\
		 	&	 1--0	&	  7458  &\ldots	    &	    6212 &   y? 	 &    7772 &\ldots	       \\
4p 3P$^0$--5d 3D	 &	 2--	&	  1418  &  0.61     &	    2036 &\ldots	 	 &    3610 &\ldots	       \\
4d 3D--5f 3F$^0$	 &	 	&	  1507  &  0.37     &	    2318 &\ldots	 	 &    3889 &   y?      \\
5d 3D--6f 3F$^0$ 	 &	 	&	  2757  &\ldots	    &	 	 &	 	 &    7487 &   0.134   \\
4f 3F$^0$--5g 3G	 &	 4--5	&	  1644  &\ldots	    &	    2648 &\ldots	 	 &    4068 &   y       \\
		 	 &	 	&		&	    &	    2647 &\ldots	 	 &    4070 &   y       \\
		 	 &	 	&		&	    &	    2646 &\ldots		 &	   &	       \\
5f 3F$^0$--6g 3G	 &	 	&	  2707  &\ldots	    &	    4707 &   y  	 &    7487 &   y       \\
5g 3G--6h 3H$^0$	 &	 	&	  2942  &\ldots	    &	    4606 &   0.077	 &    8196 &   y       \\
6h 3H$^0$--7i 3I	 &	       	&	  4930  &   y	    &	    7703 &   y  	 &    13696&\ldots	       \\

\hline 
& & \multicolumn{2}{c}{} & \multicolumn{2}{c}{\ion{N}{v}} & \multicolumn{2}{c}{\ion{C}{iv}} \\
\hline		
\multicolumn{2}{c}{IP(eV)}&\multicolumn{2}{c}{} & \multicolumn{2}{c}{97.89}&\multicolumn{2}{c}{64.49} \\							
\multicolumn{2}{c}{{\it Doublets}}&  & &&&&\\	
2s 2S-- 2p 2P$^0$	&	 1/2--3/2  &&&	  1239  &  9.0      &	    1548  &  1.34  \\
			&	 1/2--1/2  &&&	  1243  &\ldots	    &	    1551  &  0.55  \\	       
3s 2S--3p 2P$^0$	&	 1/2--3/2  &&&	  4604  &  abs      &	    5801  &  16.68 \\	       
			&	 1/2--1/2  &&&	  4620  &  abs      &	    5812  &  9.96  \\
4s 2S--4p 2P$^0$	&	 1/2--3/2  &&&	  11331 &\ldots	    &	    14335 &\ldots	   \\
			&	 1/2--1/2  &&&	  11374 &\ldots	    &	    14362 &\ldots	   \\
5s 2S--5p 2P$^0$	&	 1/2--3/2  &&&	  22572 &\ldots	    &	    28617 &\ldots	   \\
\hline
			&	 1/2--1/2  &&&	  22654 &\ldots	    &	    28675 &\ldots	   \\
\multicolumn{2}{c}{{\it Multiplets}}&  & &&&&\\					   
(4--5)		&		&&&	    1620   & 0.21      &      2530   &  0.26 \\
		&		&&&	    1622   & 0.15      &	     &	     \\
		&		&&&	    1655   &\ldots	       &	     &	     \\
(5--6)		&		&&&	    2981   &\ldots	       &      4658   & 0.42: \\
(5--7)		&		&&&	    1860   &\ldots	       &      2907   &\ldots	     \\
(6--7)		&		&&&	    4945   & 0.103     &      7726   & 1.55  \\  
(6--8)		&		&&&	    2998   &\ldots	       &      4685   & bl    \\
(7--8)		&		&&&	    7618   &\ldots	       &      1908   &	\ldots     \\
(7--9)		&		&&&	    4520   &\ldots	       &      7063   & y     \\
(8--9)		&		&&&	    10980  &\ldots	       &      17371  &\ldots	     \\
(7--10)		&		&&&	    3502   &\ldots	       &      5471   & y     \\
(8--10)		&		&&&	    6478   &\ldots	       &      10124  &\ldots	     \\
(9--10)		&		&&&	    15536  &\ldots	       &      24278  &\ldots	     \\
(8--11)		&		&&&	    4943:  &\ldots	       &      7737   & y     \\
(9--11)		&		&&&	    8927   &\ldots	       &      13954  &\ldots	     \\
(10--11)        &		&&&	    21000  &\ldots	       &      32808  &\ldots	     \\
(8--12)		&		&&&	    4191   &\ldots	       &      6560   & bl    \\
(9--12)		&		&&&	    6747   &\ldots	       &      10543  &\ldots	     \\
(10--12)	&		&&&	    11928  &\ldots	       &      18635  &\ldots	     \\
(11--12)	&		&&&	    27593  &\ldots	       &      43138  & \ldots      \\  
(9--13)		&		&&&	    5670   &\ldots	       &      8858   &\ldots	     \\
(10--13)	&		&&&	    8918   &\ldots	       &      13946  & \ldots      \\  
\hline
\end{tabular} 	
\end{table}