Example of a simulated and recaptured signal.

<p>The upper plot gives simulated <i>x</i>_<i>i</i> for a ‘gene’ of length 500, with a signal region length 100 in the middle. The background <i>x</i>_<i>i</i> are simulated as independently normally distributed with mean zero and variance 1, the signal positions are independently normally distributed with mean −1 and variance 1. The lower plot gives the <i>c</i>_<i>i</i> for this same simulation: the normalised cumulative walk. In both panels the simulated signal region is the highlighted region (from positions 201 to 300 inclusive). In the lower figure the maximum <i>Z</i> descent is marked in red. The location of the maximal descent corresponds well to the simulated signal.