\begin{table}%t1 
    %\leavevmode
    %\footnotesize
    %\centering
\par
  \caption{PRONAOS/SPM bands characteristics. $\lambda_{\rm eff,dust}$
  is the effective wavelength for a standard 30~K dust spectrum with 
  a $\lambda^{-2}$ emissivity
  law and $\lambda_{\rm eff,SZ}$ is the effective wavelength for the
  Sunyaev-Zel'dovich thermal effect (Lamarre {et~al.}  \cite{lamarre2}). 
  The definitions of $\lambda_{\rm ref}$ and $\lambda_{\rm eff}$ are detailed in
  Sect.~\ref{sect reference wavelengths}.}\label{tab_wavelength}
  \begin{tabular}{lcccc}
      \hline
      \hline
      band&1&2&3&4\\
      \hline
      $\lambda_{\rm ref}$ [$\mic$]           &200&260&360&580\\
      $\lambda_{\rm eff,dust}$ [$\mic$] &205 & 263 & 364 & 567 \\
      $\lambda_{\rm eff,SZ}$ [$\mic$] & & & 462 & 693 \\
      $\lambda$ range [$\mic$]&180--240&240--340&340--540&540--1100\\
      \hline
      \end{tabular}
  \end{table}