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I have deleted the italicised clause in the following sentence that refers to a figure that we do not have in the article yet.

For open problems, the sources of the field exist in a much smaller domain than the fields themselves, and thus the size of linear systems generated by integral equations methods are much smaller than FD or FEM, as illustrated for a small portion of two signal lines in Figure 1. SkylonS ( talk) 11:03, 4 December 2012 (UTC) reply