Graphics of probability distributions

**Figure 4:** Probability distributions
$\includegraphics[angle=-90,width=0.45\textwidth]{probs_0.ps}$ $\includegraphics[angle=-90,width=0.45\textwidth]{probs_1.ps}$ $\includegraphics[angle=-90,width=0.45\textwidth]{probs_2.ps}$ $\includegraphics[angle=-90,width=0.45\textwidth]{probs_3.ps}$ $\includegraphics[angle=-90,width=0.45\textwidth]{probs_4.ps}$ $\includegraphics[angle=-90,width=0.45\textwidth]{probs_4.ps}$