This is Circle Grid Sample.
Open a d3plot file. ( Circle Grid is only available for post-processing)
Click Circle Grid and open the interface. Set Num. X: 40, Num. Y: 20, Diameter: 6.14, Spacing: 7.36.
Click Origin(It will be default checked) , pick a point as origin in the picture, and the Xpoint will be checked automatically, then pick a point as Xpoint in the picture. The Origin and Xpoint will generate a line, it will be the x coordinate.
Click Y_node (It will be default checked after click Xpoint), it will define y direction.
Click Show, the circle grid will be show. Select Color and Line width, the circle will change.
Check Pick, and select one circle. Click Plot, the Plot window will be shown. This figure shows the circle's diameter and time relationships.