“…To increase the chances that the estimated solution is close to the true one, the minimum of the regularizing function must occur in a region of the parameter space close to the true solution (Silva, Medeiros and Barbosa 2001c, 2002). Examples of successful inversion of gravity (or magnetic) data to estimate topography by using nonspectral information are given in Fedi (1997), Richardson and MacInnes (1989), Barbosa, Silva and Medeiros (1997, 1999b), Gallardo‐Delgado, Pérez‐Flores and Gómez‐Treviño (2003), Nunes, Barbosa and Silva (2008), Martins, Barbosa and Silva (2010) and Silva, Oliveira and Barbosa (2010). Because the regularizing function imposes, on the solution, certain geological attributes, these methods differ from each other in the particular regularizing function used and therefore, in the bias imposed by the geologic information introduced through the regularizing function.…”