Export Calibration Data The Export Calibration Data command displays the standard Windows Save As dialog box. Here you specify the name of a text file that will hold the calibration data for the current model. The data are in tab delimited format. The file can be used outside of Graphic Groundwater with any program capable of reading a text file. Type in the name of the file. Graphic Groundwater will add the txt extension. Consult the Calibration Statistics window for more information on calibration data.