$\begin{figure}\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB001225.ps}\vs... ... \includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010213.ps} \end{figure}$

$\begin{figure}\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010225.ps}\vs... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010612.ps} \end{figure}$

$\begin{figure}\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010613.ps... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010923.ps} \end{figure}$

$\begin{figure}\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB010928.ps... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB011212.ps} \end{figure}$ $\begin{figure}\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB011216.ps... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020127.ps} \end{figure}$ $\begin{figure}\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020201.ps}\vs... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020317.ps} \end{figure}$

$\begin{figure}\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020331.ps... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020801.ps} \end{figure}$ $\begin{figure}\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB020812.ps}\vs... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB021004.ps} \end{figure}$ $\begin{figure}\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB021014.ps... ...\par\includegraphics[angle=-90,width=7.3cm,clip]{2820_GRB021112.ps} \end{figure}$

Online material

6 Appendix: Spectra of the 35 GRBs