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For each vertical edge, we will specify the division length next to the wall to be 0.001 and the total number of divisions to be 30. In GAMBIT, each edge has a direction associated with it as shown by an arrow. We will set this arrow to point away from the wall. Then the division next to the wall becomes the "First Length" and the division next to the axis becomes the "Last Length". We'll specify the "First Length" to be 0.001 and the total number of divisions to be 30 for the edge; GAMBIT will automatically calculate the appropriate value for the "Last Length".

Operation Toolpad > Mesh Command Button Image Added > Edge Command Button Image Added

Select the vertical edges by shift-clicking on each of them. Notice the red arrow that appears on the edge when it is selected. Make sure these arrows are pointing down (towards the axis and away from the wall). If both of these arrows are pointing in the wrong direction, you can reverse them by clicking Reverse next to Pick with links. However, if only one of the edges needs to be reversed, you can do that by shift-middle clicking on that edge. You'll have to zoom in to be able to do this. (Recall that you can zoom in by holding down the Ctrl key and then dragging a box with your left mouse button. Double-click with the middle mouse button to go back to the last view.)

For Type in the Mesh Edges menu, select First Length from the drop down box. Next to Length, type in 0.001.

We want 30 divisions on each of the vertical edges; so select Interval Count from the drop down box under Spacing and enter 30 in the text box to its left.

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