Runout and total runout

can any one explain me what is the runout and total runout in detail. if possible explain it with a pic.

Thanks in advance..

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GD&T Tolerance Zone: 2-Dimensional circular tolerance zone that is defined by a datum axis where all points on the called surface must fall into. The zone is a direct reference to the datum feature. Runout is the total variation that the reference surface can have, when the part is rotated around the datum's true axis.

More here:
http://www.gdandtbasics.com/runout/

 
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