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| Left Centerline Definition Points |
When picking points, move the mouse to the desired area and watch the zoom window so that you can accurately select the point.
First pick a point on the upper edge of the projectile. Hold down the shift key while selecting a point on the lower edge of the projectile vertically below the first. Holding down the shift key assures that the point will be directly below the first point.
These first two points are displayed in blue in the figure below.
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