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====== FlowField ====== The %%FlowField%% class represents scalar, vector, and tensor-valued fields of the form <latex> {\bf u}({\bf x}) &= \sum_{k_x,k_y,k_z,j} \hat{u}_{k_x k_y k_z j}\bar{T}_{n_y}(y) \; e^{2 \pi i (k_x x/L_x + k_z z/L_z)} {\bf e}_j </latex>