Special Dome Flat

To be sure that the Special Dome Flat you are taking are good: a 8 exposures sequence looks like that :

**Figure 9:** 1- LAMP OFF; 2- LAMP OFF WITH MASK; 3- LAMP ON WITH MASK; 4-LAMP ON
**Figure 10:** 1- LAMP ON; 2- LAMP ON WITH MASK; 3- LAMP OFF WITH MASK; 4-LAMP OFF
$\framebox{\includegraphics[width=0.20\linewidth]{flat_off.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_off_mask.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_on_mask.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_on.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_on.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_on_mask.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_off_mask.ps}}$ $\framebox{\includegraphics[width=0.20\linewidth]{flat_off.ps}}$