Fig. 5.

Stationary and non-stationary standard deviation fields of the noise ${\mathrm{\epsilon }}_i\left(\mathit{s}\right)$.

Fig. 5a: Standard Deviation 1. Stationary variance of 1 across the region.

Fig. 5b: Standard Deviation 2. Non-stationary (linear ramp) standard deviation field increasing from $\sqrt{0.5}$ to $\sqrt{1.5}$ in the y-direction.