| Estimate ''R''<sub>t</sub> , ''R''<sub>xo</sub> , and ''D''<sub>''i''</sub> in relatively fresh and oil mud systems; reduced shoulder effects | | Estimate ''R''<sub>t</sub> , ''R''<sub>xo</sub> , and ''D''<sub>''i''</sub> in relatively fresh and oil mud systems; reduced shoulder effects |