\begin{table}%t6 \caption{\label{osafit}Parameters of the Crab spectral fitting obtained for dithering spectra extracted with the PPDF and OSA 7.0 ($I$ -- {\it ip\_skymosaic}, $V$ -- {\it varmosaic}) methods. The PPDF spectrum was fitted in the 298$-$1938~keV range, OSA spectra in the 252$-$1848~keV range. Flux in the 300$-$1000~keV band is given in~erg~cm$^{-2}$~s$^{-1}$. Rows 2 and 3 show the OSA results obtained when single revolution spectra were fitted together with a free relative normalization, rows~4 and~5 correspond to the fit made for spectra extracted from all-data mosaics.} \small%\centering \par \begin{tabular}{ccccc} \hline\hline\noalign{\smallskip} Method & $\Gamma$ & Norm. & Flux & Red. $\chi^{2}$ \\ \hline\noalign{\smallskip} PPDF & 2.07 $\pm$ 0.05 & 6.2 $\pm$ 1.7 & $7.8\times 10^{-9}$ & 0.80 \\ OSA, $I$ & 2.02 $\pm$ 0.16 & 2.7 $\pm$ 2.5 & $4.6\times 10^{-9}$ & 0.19 \\ OSA, $V$ & 2.05 $\pm$ 0.07 & 3.4 $\pm$ 1.3 & $4.1\times 10^{-9}$ & 0.97 \\ OSA, $I$ & 1.98 $\pm$ 0.21 & 1.6 $\pm$ 1.8 & $3.3\times 10^{-9}$ & 0.14 \\ OSA, $V$ & 2.02 $\pm$ 0.07 & 2.3 $\pm$ 0.9 & $4.0\times 10^{-9}$ & 2.39 \\ \hline \end{tabular} \end{table}