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location in image where edge was detected

Hi All,
I want to image a white paper target that has a black square on it over several hours.  I would like to see if this target moves over time (due to the camera system drifting).
 
I'm starting from the Edge Detection Example.vi (National Instruments\LabVIEW\examples\vision\2. Functions\Caliper) but I don't know what to do inorder to get the image coordinates where the edge has been detected.  I want to log the image coordinates. 
 
Thanks in advance,
sau
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Nevermind! 

IMAQ Edge Tool gives Edge Coordinates as one of it's outputs!

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