As shown, all the pixels with intensities between 0 and 15 lie in the first bin where the height of the bin represents {HEAD ~ the total number} of {TAIL ~ pixels} in a particular bin and the sum of all the bins has been normalized to 255 
of
As shown , all the pixels with intensities between 0 and 15 lie in the first bin where the height of the bin represents { HEAD ~ the total number } of { TAIL ~ pixels } in a particular bin and the sum of all the bins has been normalized to 255
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH