\begin{table}%t3
\caption{Improved wavelengths, branching fractions and transition probabilities for Os~II. \label{osbf}}
%\centerline
{
\begin{tabular}{llrrlrr}
\hline \hline 
Upper level& Lower level& \multicolumn{1}{c}{$\sigma$}    & \multicolumn{1}{c}{$\lambda^{a}$} &\multicolumn{1}{c}{$BF^{b}$} &\multicolumn{1}{c}{$A_{ik}$}		& \multicolumn{1}{c}{Unc.} 	\\
	   &            & \multicolumn{1}{c}{(cm$^{-1}$)} & \multicolumn{1}{c}{(\AA)}			 &                
&\multicolumn{1}{c}{(10$^{6}$ s$^{-1}$)}	& \multicolumn{1}{c}{(\%)}	\\
\hline
\parent{7}{S}6p z\ls{8}{P}{7/2} & \parent{5}{D}6s a\ls{6}{D}{9/2} & 39~389.309 & 2538.002 		& 0.914~$_{{\rm SA}}$& 13.441 & 5 	\\
                     		& \parent{5}{D}6s a\ls{6}{D}{5/2} & 35~460.509 & 2819.213 		& 0.003 &  0.047 & 13	\\
                     		& 6s$^{2}$        a\ls{6}{S}{5/2} & 31~497.720 & 3173.920 		& 0.006 &  0.091 & 13	\\
                     		& 5d$^{7}$        a\ls{4}{F}{5/2} & 25~974.783 & 3848.802 		& 0.024 &  0.351 & 13	\\
				&				&	    & \textit{Residual}		& 0.053 &        & 	\\
\parent{5}{D}6p z\ls{6}{D}{7/2}	& \parent{5}{D}6s a\ls{6}{D}{9/2} & 43~802.407 & 2282.279		& 0.687~$_{{\rm SA}}$&116.358 & 6 	\\
                                & \parent{5}{D}6s a\ls{6}{D}{7/2} & 40~209.198 & 2486.247                & 0.230 & 38.935 & 9 	\\
                                & \parent{5}{D}6s a\ls{6}{D}{5/2} & 39~873.425 & 2507.185                & 0.015 &  2.550 & 11	\\
                                & 6s$^{2}$ 	  a\ls{6}{S}{5/2} & 35~910.540 & 2783.881                & 0.026 &  4.389 & 11	\\
                                &                               &           & \textit{Residual}         & 0.043 &	 & 	\\
\parent{5}{D}6p z\ls{6}{D}{3/2}	& \parent{5}{D}6s a\ls{6}{D}{5/2} & 42~228.313 & 2367.360		& 0.863 &154.138 & 5 	\\
				& \parent{5}{D}6s a\ls{6}{D}{1/2} & 39~520.618 & 2529.568                & 0.031 &  5.589 & 10 	\\
				& 6s$^{2}$        a\ls{6}{S}{5/2} & 38~265.362 & 2612.554   		& 0.028 &  4.957 & 10	\\     
				&				&	    & \textit{Residual}		& 0.078 &        & 	\\        
\parent{5}{D}6p z\ls{6}{D}{5/2} & \parent{5}{D}6s a\ls{6}{D}{7/2} & 42~780.385 & 2336.807                & 0.773 &138.090 & 5 	\\                                                                                           & \parent{5}{D}6s a\ls{6}{D}{5/2} & 42~444.611 & 2355.295                & 0.113 & 20.243 & 10 	\\         
                                & \parent{5}{D}6s a\ls{6}{D}{3/2} & 40~781.239 & 2451.370                & 0.038 &  6.833 & 12	\\  
				&				&	    & \textit{Residual}		& 0.075            	\\
\parent{5}{D}6p z\ls{6}{D}{1/2}	& \parent{5}{D}6s a\ls{6}{D}{3/2} & 42~535.886 & 2350.240		& 0.708 &120.077 & 7  	\\        
 				& \parent{5}{D}6s a\ls{6}{D}{1/2} & 41~491.584 & 2409.398                & 0.083 & 14.074 & 12	\\
                                &				&           & \textit{Residual}         & 0.110 &        & 	\\
\parent{5}{D}6p z\ls{6}{F}{5/2}	& \parent{5}{D}6s a\ls{6}{D}{5/2} & 44~869.728  & 2227.985           	& 0.606 & 90.455 & 6 	\\
            			& \parent{5}{D}6s a\ls{6}{D}{3/2} & 43~206.523  & 2313.758                & 0.162 & 24.192 & 8 	\\
            			& 6s$^{2}$        a\ls{6}{S}{5/2} & 40~906.994  & 2443.833                & 0.044 &  6.524 & 11	\\
            			& \parent{5}{D}6s a\ls{4}{D}{5/2} & 37~144.745  & 2691.376                & 0.027 &  4.055 & 11	\\
                                &                               &           & \textit{Residual}         & 0.161 &        & 	\\
\parent{5}{D}6p z\ls{6}{F}{9/2}	& \parent{5}{D}6s a\ls{6}{D}{9/2} & 51~951.749 & 1924.866	  	& 0.259~$_{{\rm SA}}$& 81.075 & 7 	\\
                        	& \parent{5}{D}6s a\ls{6}{D}{7/2} & 48~358.566 & 2067.229                & 0.442 &138.170 & 7 	\\
                        	& \parent{5}{D}6s a\ls{4}{D}{7/2} & 40~491.821 & 2468.892                & 0.089 & 27.720 & 10	\\
                        	& 5d$^{7}$        a\ls{4}{F}{7/2} & 38~747.789 & 2580.024                & 0.161 & 50.286 & 8 	\\
               			&				&           & \textit{Residual}         & 0.049 &        & 	\\
\parent{5}{D}6p z\ls{6}{F}{7/2}	& \parent{5}{D}6s a\ls{6}{D}{7/2} & 48~612.438 & 2056.432		& 0.440 & 93.699 & 7 	\\ 
                        	& \parent{5}{D}6s a\ls{6}{D}{5/2} & 48~277.689 & 2070.693                & 0.415 & 88.360 & 7 	\\
                        	& 5d$^{7}$        a\ls{4}{P}{5/2} & 34~637.168 & 2886.230                & 0.028 &  6.043 & 11	\\
				&				&           & \textit{Residual}         & 0.116 &        & 	\\
\hline
\end{tabular}}
\medskip
$^{a}$ Wavelengths above 2000~\AA\ are listed as air wavelengths and below as vacuum wavelengths.   \\
$^{b}$ SA: The transition intensity has been corrected for self-absorption.                 
\end{table}