\begin{table}%t5
 %\centering
\par
  \caption{\pronaosspm calibration error budget: absolute and band to
  band relative errors}
  \label{stepnik_tab2}
    \begin{tabular}{lcc}
      \hline
      \hline
      Error sources (3$\sigma$) &Absolute&Band-to-band\\
      \hline
       Absolute blackbody/chopper      &3\%&0\%\\
       Atmospheric optical path length &2\%&0\%\\
       Position of ICS MC1 mirror      &5\%&5\%\\
       ICS monitoring                  &1\%&1\%\\
       Background response correction  &1\%&1\%\\
       Instrument/sky coupling         &6\%&2\%\\
       Color Correction                &1\%&2\%\\
       Beam solid angle                &5\%&7\%\\
      \hline
       Calibration accuracy (3$\sigma$) &24\%&18\%\\
      \hline
       Calibration accuracy (1$\sigma$) &8\%&6\%\\
      \hline
      \end{tabular} 
\end{table}