New computer connected cathode ray tube consoles allow both the graphic display of exploration data and the on-line communication with the displayed data. Logs or selected portions of logs and scaling can be selected and displayed at will. A light sensing pen associated with the console allows operator selection of specific points on the image, i.e., light pen selection of bed and zone boundaries. With the light pen and/or an associated alphanumeric keyboard, input parameters can be entered. The capability described above allows the log analyst to monitor the solution continually, change input parameters and the solution path at will, and in a real sense perform on-line interpretation of the logs.

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