 we plot the
predictive distribution.</p>

<center><img src="f3.gif"  alt="f3.gif"></center><br>

<p>This plot shows clearly, that the model is indeed quite different from
the generating process. This is due to the different specifications of
both the mean and covariance functions. Below we'll try to do a better
job, by allowing more flexibility in the specification.</p>

<p>Note that the confidence interval in this plot is the confidence for
the distribution of the (noisy) <em>data</em>. If instead you wan