\begin{table}
%\centering
\par
\caption {\label{SiC2-lines}Observed SiC$_2$ transitions $J^u$$_{\rm Ka,Kc}-J^l$$_{\rm Ka,Kc}$. }
\begin{tabular}{ccrccc}
\hline\hline
\noalign{\smallskip}
Transition    & Obs. Freq. & $\rm o-c$ &$S$& $E_{\rm{l}}$/k&    $I_{\varv}$\\
$J^u$$_{\rm Ka,Kc}-J^l$$_{\rm Ka,Kc}$  & (MHz)    & (MHz)&    & (K)& (K km~s$^{-1}$)\\
\hline\\[-2ex]
24$_{~~2,22}$--23$_{~~2,21}$ &557109.0(1.5)&    1.43& 23.5 & 328.2 &  1.42( 3)\\
24$_{12,13}$--23$_{12,12}$       &557600.0(1.5)&    0.27& 18.0 & 589.7 &  0.32( 3)\\
24$_{12,12}$--23$_{12,11}$       &557600.0(1.5)&    0.27& 18.0 & 589.7 &  0.32( 3)\\
24$_{10,15}$--23$_{10,14}$       &562069.0(5.0)& $-$1.09& 19.9 & 505.2 &  0.45(11)\\
24$_{10,14}$--23$_{10,13}$       &562069.0(5.0)& $-$1.09& 19.9 & 505.2 &  0.45(11)\\
24$_{~~8,17}$--23$_{~~8,16}$ &566903.0(6.0)&    7.29& 21.4 & 436.6 &  0.74( 5)\\
24$_{~~8,16}$--23$_{~~8,15}$ &566912.0(6.0)&    9.90& 21.4 & 436.6 &  0.74( 5)\\
24$_{~~4,21}$--23$_{~~4,20}$ &568464.0(1.5)& $-$0.55& 23.3 & 346.2 &  1.25( 2)\\
25$_{16,10}$--24$_{16,~~9}$    &571113.0(6.0)&    2.06& 14.8 & 832.7 &  0.14( 3)\\
25$_{16,~~9}$--24$_{16,~~8}$ &571113.0(6.0)&    2.06& 14.8 & 832.7 &  0.14( 3)\\
23$_{~~4,19}$--22$_{~~4,18}$ &571141.0(1.5)&    2.43& 22.4 & 324.6 &  1.46( 2)\\
24$_{~~6,19}$--23$_{~~6,18}$ &572966.0(1.5)&    2.02& 22.5 & 384.1 &  0.90( 2)\\
27$_{~~0,27}$--26$_{~~0,26}$ &573938.0(1.5)& $-$0.07& 26.9 & 364.7 &  1.48( 2)\\
26$_{~~2,25}$---25$_{~~2,24}$ &574425.0(1.5)&    1.53& 25.7 & 361.9 &  1.27( 2)\\
24$_{~~6,18}$-23$_{~~6,17}$ &574577.0(1.5)&    3.70& 22.5 & 384.2 &  1.02( 2)\\
25$_{14,12}$--24$_{14,11}$       &576122.0(6.0)& $-$3.08& 17.2 & 716.6 &  0.13( 3)\\
25$_{14,11}$--24$_{14,10}$       &576122.0(6.0)& $-$3.08& 17.2 & 716.6 &  0.13( 3)\\
25$_{~~2,23}$-24$_{~~2,22}$ &577234.0(1.5)&    0.69& 24.5 & 355.0 &  1.39( 2)\\
25$_{12,14}$--24$_{12,13}$       &580951.0(1.5)&    0.97& 19.3 & 616.4 &  0.31( 2)\\
25$_{12,13}$--24$_{12,12}$       &580951.0(1.5)&    0.97& 19.3 & 616.4 &  0.31( 2)\\
25$_{10,16}$--24$_{10,15}$       &585735.0(1.5)& $-$0.44& 21.0 & 532.2 &  0.44( 2)\\
25$_{10,15}$--24$_{10,14}$       &585735.0(1.5)& $-$0.44& 21.0 & 532.2 &  0.44( 2)\\
25$_{~~8,18}$--24$_{~~8,17}$ &590972.0(2.5)&    0.41& 22.5 & 463.8 &  0.66( 2)\\
25$_{~~4,22}$--24$_{~~4,21}$ &590814.0(1.5)& $-$1.58& 24.3 & 373.5 &  1.09( 1)\\
25$_{~~8,17}$--24$_{~~8,16}$ &590990.0(2.5)&    3.89& 22.5 & 463.8 &  0.66( 2)\\
28$_{~~0,28}$--27$_{~~0,27}$ &594745.0(1.5)& $-$0.57& 27.9 & 392.2 &  1.46( 3)\\
27$_{~~2,26}$--26$_{~~2,25}$ &595235.0(1.5)&    2.63& 26.7 & 389.4 &  1.43( 3)\\
24$_{~~4,20}$--23$_{~~4,19}$ &596691.0(1.5)&    0.51& 23.4 & 352.0 &  1.76( 2)\\
25$_{~~6,20}$--24$_{~~6,19}$ &597462.0(5.0)& $-$0.07& 23.6 & 411.6 &  0.86( 4)\\
26$_{~~2,24}$--25$_{~~2,23}$ &597477.0(2.5)& $-$0.93& 25.5 & 382.7 &  1.10( 4)\\
26$_{14,13}$--25$_{14,12}$       &599184.0(4.0)& $-$9.03& 18.5 & 744.2 &  0.14( 2)\\
26$_{14,12}$--25$_{14,11}$       &599184.0(4.0)& $-$9.03& 18.5 & 744.2 &  0.14( 2)\\
25$_{~~6,19}$--24$_{~~6,18}$ &599914.0(1.5)&    0.11& 23.6 & 411.8 &  0.85( 2)\\
26$_{12,14}$--25$_{12,13}$       &604324.0(6.0)&    7.38& 20.5 & 644.3 &  0.38( 3)\\
26$_{12,15}$--25$_{12,14}$       &604324.0(6.0)&    7.38& 20.5 & 644.3 &  0.38( 3)\\
26$_{10,16}$--25$_{10,15}$       &609433.0(1.5)& $-$0.94& 22.2 & 560.3 &  0.47( 1)\\
26$_{10,17}$--25$_{10,16}$       &609433.0(1.5)& $-$0.94& 22.2 & 560.3 &  0.47( 1)\\
26$_{~~4,23}$--25$_{~~4,22}$ &612914.0(1.5)& $-$0.82& 25.3 & 401.8 &  1.09( 1)\\
26$_{~~8,19}$--25$_{~~8,18}$ &615115.0(4.0)& $-$0.21& 23.6 & 492.2 &  0.78( 2)\\
26$_{~~8,18}$--25$_{~~8,17}$ &615139.0(4.0)&    2.45& 23.6 & 492.2 &  0.70( 2)\\
27$_{16,12}$--26$_{16,11}$       &616666.0(6.0)& $-$1.46& 17.6 & 888.7 &  0.06( 1)\\
27$_{16,11}$--26$_{16,10}$       &616666.0(6.0)&    5.55& 17.6 & 888.7 &  0.06( 1)\\
29$_{~~0,29}$--28$_{~~0,28}$ &615547.0(1.5)&    5.55& 28.9 & 420.8 &  1.55( 2)\\
27$_{~~2,25}$--26$_{~~2,24}$ &617833.0(1.5)&    0.71& 26.5 & 411.3 &  1.15( 2)\\
25$_{~~4,21}$--24$_{~~4,20}$ &621588.0(1.5)& $-$1.38& 24.5 & 380.6 &  1.36( 2)\\
26$_{~~6,21}$--25$_{~~6,20}$ &621960.0(1.5)&    0.96& 24.7 & 440.3 &  0.91( 2)\\
27$_{14,14}$--26$_{14,13}$ &      622264.0(6.0)& $-$1.00& 19.8 & 773.0 &  0.11( 1)\\
27$_{14,13}$--26$_{14,12}$ &      622264.0(6.0)& $-$1.00& 19.8 & 773.0 &  0.11( 1)\\
26$_{~~6,20}$--25$_{~~6,19}$ &625591.0(1.5)& $-$1.43& 24.7 & 440.6 &  1.06( 2)\\
27$_{12,16}$--26$_{12,15}$ &      627699.0(1.5)& $-$0.23& 21.7 & 673.3 &  0.34( 1)\\
27$_{12,15}$--26$_{12,14}$ &      627699.0(1.5)& $-$0.23& 21.7 & 673.3 &  0.34( 1)\\
27$_{10,17}$--26$_{10,16}$ &      633168.0(1.5)& $-$0.26& 23.3 & 589.6 &  0.45( 2)\\
27$_{10,18}$--26$_{10,17}$ &      633168.0(1.5)& $-$0.26& 23.3 & 589.6 &  0.45( 2)\\
27$_{~~4,24}$--26$_{~~4,23}$ &634776.0(1.5)& $-$2.96& 26.3 & 431.2 &  1.15( 3)\\
30$_{~~0,30}$--29$_{~~0,29}$ &636346.0(1.5)&    0.01& 29.9 & 450.3 &  1.25( 4)\\
\hline\\[-2ex]
\end{tabular}
\tablefoot {The first column lists the 
quantum numbers of the transitions. $\rm o-c$ corresponds to observed minus
calculated frequencies.
$S$ is the line strength and $E_{\rm{l}}$ is the energy of the lower level 
of the transition. 
$I_{\varv}=\int{T_A{\rm d}\varv}$ is the integrated intensity.
Values in parentheses are uncertainies in units of the last digits.}
\end{table}