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Given two sets of equally spaced grid points: x_1,...,x_m with spacing \delta x, and y_1,...,y_n with spacing \delta y, plus a set of function values z_{ij} for each grid point (x_i,y_j), the routines described in this section compute a continuous interpolation function z(x,y) such that z(x_i,y_j) = z_{ij}.