#  pI undefined
#  pH 	   chg
  0.00	 -0.00
  0.50	 -0.00
  1.00	 -0.01
  1.50	 -0.03
  2.00	 -0.08
  2.50	 -0.23
  3.00	 -0.53
  3.50	 -0.94
  4.00	 -1.36
  4.50	 -1.70
  5.00	 -1.89
  5.50	 -1.96
  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	 -2.01
 10.00	 -2.02
 10.50	 -2.05
 11.00	 -2.14
 11.50	 -2.34
 12.00	 -2.62
 12.50	 -2.85
 13.00	 -2.97
 13.50	 -3.08
 14.00	 -3.25