Specifies a, the slope, in degrees, of the reducer transition.
If you do not specify Alpha, the actual length of the sloped portion of reducer is unknown. The software then assumes the slope is equal to the arc tangent 1/2(the change in diameters) / (length of sloped portion of reducer) and that the length of the sloped portion of the reducer is equal to 60% of the total reducer length.
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If you do not define a value for Alpha, the software reports the alpha value in the Errors and Warnings dialog box.
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A value for Alpha is required for IGE/TD/12.