#threshold	 tiles	x-edges	y-edges	vertices
#---------	 -----	-------	-------	--------
0.000000	     9	     12	     12	      16	1	1	     1
0.501961	     1	      2	      2	       4	0.111111	0.333333	     1
#  check:	     0	      0	      0	       0

#threshold	 tiles	x-edges	y-edges	vertices
#---------	 -----	-------	-------	--------
0.000000	     9	     12	     12	      16	1	1	     1
1.000000	     5	     10	     10	      16	0.555556	1.66667	     1
#  check:	     0	      0	      0	       0

#threshold	 tiles	x-edges	y-edges	vertices
#---------	 -----	-------	-------	--------
0.000000	   224	    240	    238	     255	1	1	     1
1.000000	    56	    112	    112	     224	0.25	3.73333	    56
#  check:	     0	      0	      0	       0