#  pI = 5.48
#  pH      chg
  0.00	  1.00
  0.50	  1.00
  1.00	  1.00
  1.50	  0.99
  2.00	  0.97
  2.50	  0.91
  3.00	  0.77
  3.50	  0.52
  4.00	  0.25
  4.50	  0.10
  5.00	  0.03
  5.50	 -0.00
  6.00	 -0.03
  6.50	 -0.11
  7.00	 -0.27
  7.50	 -0.55
  8.00	 -0.82
  8.50	 -1.02
  9.00	 -1.23
  9.50	 -1.51
 10.00	 -1.78
 10.50	 -1.94
 11.00	 -2.06
 11.50	 -2.22
 12.00	 -2.49
 12.50	 -2.76
 13.00	 -2.94
 13.50	 -3.06
 14.00	 -3.24