#  pI undefined
#  pH 	   chg
  0.00	 -0.00
  0.50	 -0.00
  1.00	 -0.01
  1.50	 -0.03
  2.00	 -0.09
  2.50	 -0.24
  3.00	 -0.56
  3.50	 -1.02
  4.00	 -1.47
  4.50	 -1.77
  5.00	 -1.92
  5.50	 -1.97
  6.00	 -1.99
  6.50	 -2.00
  7.00	 -2.00
  7.50	 -2.00
  8.00	 -2.00
  8.50	 -2.00
  9.00	 -2.00
  9.50	 -2.00
 10.00	 -2.01
 10.50	 -2.03
 11.00	 -2.10
 11.50	 -2.26
 12.00	 -2.52
 12.50	 -2.78
 13.00	 -2.95
 13.50	 -3.07
 14.00	 -3.24