HISTO

histo
Plot a histogram

         histo(X)
         histo(X,M,odd,scale)

         Data is X, approximate number of bins is M, and odd
         should be 0 or 1 for placement of bins. Least significant 
         digit of bin width will always be 1, 2 or 5. Last argument 
	  should be one for scaling in order to have the area 1 under
	  the histogram instead of area n.