\begin{table}%t5
  \caption{\label{crsfisgri}Best fit parameters for the fundamental and the first harmonic CRSF.
    } 
\par
%\centering
                          % used for centering table
\small\begin{tabular}{r r c c}        % centered columns (3 columns)
\hline\hline                 % inserts double horizontal lines
Component & Parameter &  &    \\    % table heading 
\hline                        % inserts single horizontal line
{\rm Continuum} &   $\alpha$ & & 0.29 (frozen) \\      % inserting body of the table
  & $E_{\rm cut}$ & (keV) & 9.1 (frozen) \\
  &  &  & \\
{\rm  Fundamental} & $E_{c_1}$ & (keV) & $\rm 21.4^{+0.9}_{-2.4}$ \\[1mm]
   & $\tau_{c_1}$ &  & $\rm 0.43^{+0.3}_{-0.07}$ \\[1mm]
   & $\sigma_{c_1}$ & (keV) & $\rm 3^{+4}_{-2}$ \\
 & & & \\
{\rm 1{st} Harmonic} &    $E_{c_2}$ & (keV) & $\rm 47.1^{+2.2}_{-1.7}$ \\[1mm]
   & $\tau_{c_2}$ &  & $\rm 0.88^{+0.5}_{-0.24}$ \\[1mm]
   & $\sigma_{c_2}$ & (keV) & $\rm 5^{+5}_{-2.3}$ \\
 & & & \\
 &  $\chi^2_{\nu}$(d.o.f.) &  & 1.4(41) \\ 
\hline                                   %inserts single line
\end{tabular}
\end{table}