How to use the controls above:
Zoom in Zoom out Pan left Pan up Pan right Pan down
Return to original view Silde to zoom
After you zoom in, you can drag the red box to move around your image.
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Zoom in 
Zoom out 
Pan left 
Pan up 
Pan right 
Pan down
Return to original view 
Silde to zoom
After you zoom in, you can drag the red box to move around your image.