On the left end some lines show grey bordes. This is due to conversion for the original EPS-file to a PNG-file. It is only visable if you inspect the image really closely.

# Python script
from math import *
def f(x):
	return (1.0+floor(sin(10*x*x-0.3)))
l=[]
for x in range(0,2000,1):
	l+=[ f(x/300.0)]

for i in range(len(out)-700):
	print ""
	for j in range(100):
		print i,j,l[i+100] 
 # plot the result unsing gnuplot with pm3d 

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