# pI undefined
#   pH 	   chg
  0.00	 -0.00
  0.50	 -0.00
  1.00	 -0.00
  1.50	 -0.01
  2.00	 -0.03
  2.50	 -0.08
  3.00	 -0.21
  3.50	 -0.45
  4.00	 -0.72
  4.50	 -0.89
  5.00	 -0.96
  5.50	 -0.99
  6.00	 -1.00
  6.50	 -1.00
  7.00	 -1.00
  7.50	 -1.00
  8.00	 -1.00
  8.50	 -1.00
  9.00	 -1.01
  9.50	 -1.03
 10.00	 -1.10
 10.50	 -1.25
 11.00	 -1.52
 11.50	 -1.77
 12.00	 -1.92
 12.50	 -1.98
 13.00	 -2.01
 13.50	 -2.06
 14.00	 -2.19