#  pI = 5.55
#  pH 	   chg
  0.00	  1.00
  0.50	  1.00
  1.00	  1.00
  1.50	  0.99
  2.00	  0.98
  2.50	  0.94
  3.00	  0.84
  3.50	  0.62
  4.00	  0.34
  4.50	  0.14
  5.00	  0.05
  5.50	  0.00
  6.00	 -0.03
  6.50	 -0.11
  7.00	 -0.28
  7.50	 -0.56
  8.00	 -0.80
  8.50	 -0.93
  9.00	 -0.98
  9.50	 -0.99
 10.00	 -1.00
 10.50	 -1.00
 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