\begin{table}%t1
\caption{\label{table:irrchange}TSI differences with FALC model per 1\% area (in $\rm W/m^2$).} 
%\centering
\par
\begin{tabular}{ l    c  c  c } % centered columns (4 columns)
\hline
\hline\noalign{\smallskip}
      & FALF &   FALP & FALS\\ % table heading
\hline % inserts single horizontal line
  LTE G91                        &    0.28   &  1.48      &  --10.7 \\
   LTE A05                         &      0.25   & 1.27   & --10.82  \\
  NLTE G91                     &       0.18 &  0.76  &  --11.02  \\
  NLTE comb.   &    0.15 & 0.99   &  --11.05  \\
\hline  
\end{tabular}
\end{table}