The topmost part of the window shows the values of the number of geophones, the geophone spacing, and the shot offset. The program assumes the shots are aligned in the line of geophones but outside the first and last geophones by a distance equal to the shot position (it is possible to have an interior shot by specifying a negative shot position, but this isn't recommended). The total length of the geophone spread is (number of geophones - 1) *(geophone spacing), and the total distance from shot to shot is (number of geophones - 1) *(geophone spacing)+2*(shot offset).
The list box with layers listed allows editing the thickness of a layer and the dip of the bottom of the layer (positive is dipping down towards the first geophone/forward shot). For changes to the model to be displayed in the travel times or on the Plot Window, you have to click on the Update Times and Plots button. Alternatively, the layer geometry can be set in the Preferences Window to show the thicknesses of a layer under each shot or the depth of a layer's base under each shot:
Layers can be added or removed using the Add Layer or Delete Layer buttons.
If the Plot Window is open and lines have been fit to data, then clicking on the Model from Plot button will generate a new model and update the model times shown both in this window and in the Plot Window. Note that the model resulting from the inversion might change the lines shown on the Plot Window quite dramatically; in some cases, a better result will be obtained by carefully adjusting the model parameters by hand. If your lines are aphysical in some way, you will get an error message detailing the problem and a likely course in fixing it.
The bottom list gives the arrival times at each geophone along with the distance from the relevant shot. The widths of columns can be adjusted by dragging the divider between the headers of a column. The list can be sorted by any column by clicking on the column header (second click will reverse the direction of sorting).
The model can be saved to a file (Save Model menu item from the File menu) or copied to the clipboard.