Fig. 11

Examples of the heterogeneity grid values of ${\mu }_i$ and ${\lambda }_j$ for $M=15$. Top: the ${\lambda }_j$ values are randomly chosen from a unit normal distribution. Middle: the ${\lambda }_j$ values are chosen by uniformly sampling the inverse cumulative distribution function of a unit normal distribution. Bottom: the ${\lambda }_j$ values are the roots of $H_{15}$, the 15th Hermite polynomial. In all cases, the ${\mu }_i$ are roots of $P_{10}$, the 10th Legendre polynomial.