There are five possible preferences for Refract:
The Significant Digits to Display outside user-entered areas can be set. This is mainly of interest for seeing the calculated values in the Data Windows.
Use Uncertainties on Data will display error bars in the Data Windows and any uncertainties entered will be displayed on the Plot Window.
The First geophone number can be set so that successive geophones are numbered starting from this value.
You can choose how you want to see and edit model parameters in the Model Window through the set of radio buttons:
Which view you prefer depends on the problem you are trying to solve.
An advanced option is to use a reduction velocity in plotting travel times in the Plot Window. Time in the Plot Window is replaced with (time- distance/reduction velocity). This is discussed in more detail on the Reduction Velocity page.