#  pI = 1.07
#  pH 	   chg
  0.00	  0.05
  0.50	  0.02
  1.00	  0.00
  1.50	 -0.01
  2.00	 -0.04
  2.50	 -0.11
  3.00	 -0.30
  3.50	 -0.67
  4.00	 -1.15
  4.50	 -1.58
  5.00	 -1.83
  5.50	 -1.94
  6.00	 -1.98
  6.50	 -1.99
  7.00	 -2.00
  7.50	 -2.00
  8.00	 -2.00
  8.50	 -2.00
  9.00	 -2.01
  9.50	 -2.03
 10.00	 -2.09
 10.50	 -2.23
 11.00	 -2.49
 11.50	 -2.75
 12.00	 -2.91
 12.50	 -2.97
 13.00	 -3.01
 13.50	 -3.05
 14.00	 -3.16