If {HEAD ~ the largest distance} is greater than {TAIL ~ the maximum distance}, then the virtual slide image is designated as needing a manual inspection 
If { HEAD ~ the largest distance } is greater than { TAIL ~ the maximum distance } , then the virtual slide image is designated as needing a manual inspection
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH