Depending on {HEAD ~ the distribution} of object and surrounding pixels in {TAIL ~ a special experiment}, a specific value can be defined for this constant 
Depending on { HEAD ~ the distribution } of object and surrounding pixels in { TAIL ~ a special experiment } , a specific value can be defined for this constant
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH