#  pI = 1.52
#  pH    chg
  0.00	  0.16
  0.50	  0.06
  1.00	  0.02
  1.50	  0.00
  2.00	 -0.02
  2.50	 -0.05
  3.00	 -0.15
  3.50	 -0.36
  4.00	 -0.64
  4.50	 -0.85
  5.00	 -0.95
  5.50	 -0.98
  6.00	 -0.99
  6.50	 -1.00
  7.00	 -1.00
  7.50	 -1.00
  8.00	 -1.00
  8.50	 -1.00
  9.00	 -1.00
  9.50	 -1.00
 10.00	 -1.00
 10.50	 -1.00
 11.00	 -1.00
 11.50	 -1.01
 12.00	 -1.04
 12.50	 -1.13
 13.00	 -1.36
 13.50	 -1.82
 14.00	 -2.38