#  pI = 6.48
#  pH 	   chg
 0.00	  1.00
 0.50	  1.00
 1.00	  1.00
 1.50	  0.99
 2.00	  0.97
 2.50	  0.92
 3.00	  0.79
 3.50	  0.54
 4.00	  0.27
 4.50	  0.10
 5.00	  0.04
 5.50	  0.01
 6.00	  0.00
 6.50	 -0.00
 7.00	 -0.00
 7.50	 -0.01
 8.00	 -0.04
 8.50	 -0.11
 9.00	 -0.29
 9.50	 -0.56
10.00	 -0.80
10.50	 -0.93
11.00	 -0.98
11.50	 -0.99
12.00	 -1.00
12.50	 -1.00
13.00	 -1.01
13.50	 -1.03
14.00	 -1.09