#  pI = 7.37
#  pH 	   chg
  0.00	  1.38
  0.50	  1.16
  1.00	  1.06
  1.50	  1.02
  2.00	  1.01
  2.50	  1.00
  3.00	  1.00
  3.50	  1.00
  4.00	  0.99
  4.50	  0.97
  5.00	  0.92
  5.50	  0.78
  6.00	  0.53
  6.50	  0.26
  7.00	  0.08
  7.50	 -0.03
  8.00	 -0.16
  8.50	 -0.40
  9.00	 -0.68
  9.50	 -0.87
 10.00	 -0.95
 10.50	 -0.99
 11.00	 -1.00
 11.50	 -1.00
 12.00	 -1.00
 12.50	 -1.00
 13.00	 -1.00
 13.50	 -1.00
 14.00	 -1.00