#  pI = 6.41
#  pH 	   chg
  0.00	  2.04
  0.50	  2.01
  1.00	  1.99
  1.50	  1.96
  2.00	  1.89
  2.50	  1.71
  3.00	  1.43
  3.50	  1.17
  4.00	  0.99
  4.50	  0.80
  5.00	  0.54
  5.50	  0.26
  6.00	  0.08
  6.50	 -0.02
  7.00	 -0.15
  7.50	 -0.42
  8.00	 -0.90
  8.50	 -1.45
  9.00	 -1.87
  9.50	 -2.21
 10.00	 -2.54
 10.50	 -2.82
 11.00	 -3.00
 11.50	 -3.18
 12.00	 -3.45
 12.50	 -3.72
 13.00	 -3.89
 13.50	 -3.97
 14.00	 -4.00