\begin{table}%t2
\caption{\label{table 2}Rate coefficients for rotational transitions  in CH$^{+}$ induced by collisions with $^{4}$He.}
%\centering
\par
\begin{tabular}{lcccccccc}
\hline \hline\noalign{\smallskip}
   & & \multicolumn{6}{c}{Rate coefficients\tablefootmark{a,} \tablefootmark{b} for $T$ [K] }\\
    $j$ & $j'$ & 20 & 20 & 20&200&200 & 200  \\
\hline
   1 & 0 & $5.8466(11)$ & $7.2588(11)$&$7.4224(11)$&$1.0751(10)$&$9.5767(11)$ & $9.6190(11)$  \\
   1 & 1 & $-$&$2.3812(9)$&$2.3746(9)$&$-$&$3.4657(9)$ & $3.4826(9)$  \\
 2 & 0 & $2.8660(11)$ &$3.4755(11)$&$3.5739(11)$& $5.0520(11)$&$5.3311(11)$ & $5.4081(11)$  \\
    2 & 1 &$8.4872(11)$ & $1.0161(10)$&$9.8195(11)$&$1.0850(10)$&$1.003(10)$ & $9.5990(11)$  \\
     2 & 2 &  $-$ & $2.3320(9)$&$2.3377(9)$&$-$&$3.066(9)$ &  $3.0778(9)$  \\
%%         \hline
   3 & 0  & $1.7680(11)$ &$1.0219(11)$&$9.6185(12)$& $2.2032(11)$&$1.8219(11)$ & $1.7025(11)$  \\         
%%    \hline
 3 & 1 & ${\bf 4.5180(11)}$ &${\bf 6.0924(11)}$&$6.2884(11)$&$7.7504(11)$&$8.0612(11)$ & $8.2536(11)$  \\   
%%%    \hline
   3 & 2 &  $5.6543(11)$ & $6.1963(11)$&$5.5323(11)$&$6.8615(11)$&$6.7521(11)$ & $6.1452(11)$  \\       
%%%    \hline 
    3 & 3 & $-$ &$2.400(9)$&$2.4154(9)$& $-$&$2.8405(9)$ & $2.8559(9)$  \\   
     4 & 0  & ${\bf 7.5614(12)}$ & $8.5746(12)$ &${\bf 9.5185(12)}$&${\bf 9.9479(12)}$& ${\bf 8.2419(12)}$&$8.7148(12)$  \\ 
%%%      \hline
   4 & 1 & $1.6563(11)$ & $1.6156(11)$ &$1.3501(11)$&$1.7853(11)$&$1.7541(11)$&$1.5640(11)$  \\    
%%%   \hline
   4 & 2 &  $8.2166(11)$ & $8.9443(11)$ & $9.0664(11)$&$9.3404(11)$&$9.4334(11)$&$9.5491(11)$  \\   
%%%   \hline
    4 & 3 & $3.0398(11)$ & $3.0153(11)$&$ 2.7061(11)$& ${\bf 3.8524(11)}$&${\bf 3.9813(11)}$&${\bf 5.5256(11)}$  \\  
    4 & 4 & $-$& $2.4349(9)$& $2.4456(9)$&$-$&$2.7438(9)$&$2.7618(9)$  \\
%%%    \hline
    5 & 0 &  $1.3958(12)$ & $1.0406(12)$ &$8.2901(13)$&$1.7300(12)$&$1.4961(12)$& $1.2577(12)$  \\  
%% %   \hline
  5 & 1&  $2.0644(11)$ & $2.2282(11)$ &$2.2562(11)$&$2.3223(11)$&$2.1505(11)$& $2.1577(11)$  \\  
%%%\hline   
   5 & 2&$5.9203(12)$ & ${\bf 6.4916(12)}$ &${\bf 5.3114(12)}$&$8.0216(12)$&$9.1121(12)$&$7.9681(12)$  \\    
%%%   \hline
   5 & 3& $8.2678(11)$ & $8.6323(11)$ &$8.4631(11)$& $8.6049(11)$&$8.6465(11)$&$8.5930(11)$  \\     
%%%   \hline
   5 & 4& $1.8246(11)$ & $1.6934(11)$ &$1.6838(11)$&$2.2074(11)$&$2.2844(9)$& $2.0669(11)$  \\  
   5 & 5&  $-$ & $2.4951(9)$ & $2.5006(9)$&$-$&$2.7418(9)$&$2.7420(9)$  \\ 
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{In units of cm$^{3}$ molecule$^{-1}$ s$^{-1}$;}
\tablefoottext{b}{$a(b)$ means $a\times 10^{-b}$.}} \vspace*{-1.7mm}
\end{table}