#  pI = 0.99
#  pH 	   chg
  0.00	  0.05
  0.50	  0.01
  1.00	 -0.00
  1.50	 -0.01
  2.00	 -0.05
  2.50	 -0.14
  3.00	 -0.37
  3.50	 -0.76
  4.00	 -1.23
  4.50	 -1.62
  5.00	 -1.85
  5.50	 -1.95
  6.00	 -1.98
  6.50	 -1.99
  7.00	 -2.00
  7.50	 -2.00
  8.00	 -2.00
  8.50	 -2.01
  9.00	 -2.02
  9.50	 -2.07
 10.00	 -2.19
 10.50	 -2.49
 11.00	 -2.97
 11.50	 -3.46
 12.00	 -3.78
 12.50	 -3.92
 13.00	 -3.98
 13.50	 -3.99
 14.00	 -4.00