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We discuss a practical approach for multisource, multifrequency controlled-source electromagnetic ͑CSEM͒ modeling. The approach consists of an efficient iterative multigridbased solver and an automatic gridding procedure. For a given frequency and a given source location, the automatic gridding procedure ensures that the computational grid is consistent with the discretization of the electromagnetic equations. The conductivity is mapped from the input grid onto the automatically defineddoi:10.1190/1.2744234 fatcat:o3ykgb5odrhfviswdpw5zuvuj4