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Comparison of accuracy between the conventional SGFD method and the lowrank methods

The study of the accuracy is important especially for the heterogeneous media. However, for lowrank methods, it is hard to derive the theoretical accuracy order as what the Taylor-series expansion based SGFD method usually did. In this section, we compare the accuracy of the conventional SGFD method and the new lowrank methods numerically. We focus on the variable velocity case in the following analysis.