\begin{table}%t1
%\centering
\par
\caption{Adopted low chromospheric model for the average quiet Sun.
\label{table:1}}
\small
\begin{tabular}{c c c c c}        % centered columns (4 columns)
\hline\hline 
\noalign{\smallskip}                % inserts double horizontal lines
Height (km) & $T$(K) & $V$ (km $\rm{s}^{-1}$) & $N_{\rm{H}}~(\rm{cm}^{-3})$ & $N_{\rm{e}}~(\rm{cm}^{-3})$ \\
\hline                        % inserts single horizontal line
 1750  & 6785  &  8.17  &  4.17E+11  &  8.38E+10 \\
 1660  & 6750  &  7.64  &  6.19E+11  &  7.62E+10 \\
 1580  & 6710  &  7.16  &  8.90E+11  &  7.48E+10 \\
 1500  & 6670  &  6.66  &  1.30E+12  &  8.00E+10 \\
 1420  & 6615  &  6.14  &  1.94E+12  &  8.83E+10 \\
 1340  & 6540  &  5.58  &  2.97E+12  &  9.63E+10 \\
 1270  & 6420  &  5.06  &  4.45E+12  &  1.01E+11 \\
 1180  & 6200  &  4.32  &  7.87E+12  &  1.01E+11 \\
 1080  & 5840  &  3.37  &  1.62E+13  &  8.00E+10 \\
  990  & 5520  &  2.61  &  3.27E+13  &  6.35E+10 \\
  925  & 5290  &  2.27  &  5.56E+13  &  5.16E+10 \\
  860  & 5080  &  2.01  &  9.64E+13  &  4.37E+10 \\
  810  & 4940  &  1.77  &  1.50E+14  &  4.09E+10 \\
  770  & 4850  &  1.58  &  2.14E+14  &  4.22E+10 \\
  720  & 4750  &  1.35  &  3.38E+14  &  4.92E+10 \\
  660  & 4650  &  1.09  &  5.90E+14  &  6.85E+10 \\
\hline                                   %inserts single line
\end{tabular}
\end{table}