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image.rotatebeam - Function
1.1.1 rotate the image’s beam(s) counterclockwise through the specified angle.
This method rotates the attached image’s beam(s) counterclockwise through the specified angle. This is the same thing as increasing the position angle(s) of the beam(s) by the specified angle. If the image does not have a beam, no changes to the image are made. If the image has multiple beams, all the beams are rotated through the same angle.
Angle by which to rotate image’s beam(s). Default is no rotation.
# rotate any and all beams in the image (increase their position angles) by 30 degrees.
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