A variety of techniques, which include Werner deconvolution , the Euler method , Naudy's method , Phillips' method , and the analytic signal method , which analyze digital analytic signal method magnetic profiles or maps to obtain estimates of source body depth without specific user identification of key portions of anomalies. This contrasts with profile techniques such as Peters' method (half-slope) or Vacquier's method (straight slope) which may be implemented as computer programs but require interactive identification of special points on anomalies.