Data from Figure 8 of Schultz, Krstic, Lee & Raymond 2008, ApJ, xxx, yyyy

H^+ + H ionization recommended cross section from Janev & Smith 1993, Atomic
and Plasma-Material Interaction Data for Fusion, 4, 1

1 atomic unit of square distance = 2.80e-17 cm^2

   E_CM(eV)    v(km s^-1)  ionization cross section (atomic units) 
   1.00E+01    6.19E+01    3.50E-09
   1.34E+01    7.17E+01    1.05E-08
   1.80E+01    8.32E+01    3.14E-08
   2.42E+01    9.64E+01    9.40E-08
   3.26E+01    1.12E+02    2.81E-07
   4.38E+01    1.29E+02    8.40E-07
   5.88E+01    1.50E+02    2.51E-06
   7.90E+01    1.74E+02    7.48E-06
   1.06E+02    2.02E+02    2.22E-05
   1.43E+02    2.34E+02    6.57E-05
   1.91E+02    2.71E+02    1.92E-04
   2.57E+02    3.14E+02    5.54E-04
   3.46E+02    3.64E+02    1.55E-03
   4.64E+02    4.22E+02    4.15E-03
   6.24E+02    4.89E+02    1.04E-02
   8.38E+02    5.67E+02    2.36E-02
   1.13E+03    6.57E+02    4.86E-02
   1.51E+03    7.61E+02    9.06E-02
   2.03E+03    8.82E+02    1.56E-01
   2.73E+03    1.02E+03    2.53E-01
   3.67E+03    1.19E+03    4.03E-01
   4.92E+03    1.37E+03    6.73E-01
   6.61E+03    1.59E+03    1.19E+00
   8.89E+03    1.85E+03    2.04E+00
   1.19E+04    2.14E+03    3.15E+00
   1.60E+04    2.48E+03    4.21E+00
   2.15E+04    2.87E+03    4.91E+00
   2.89E+04    3.33E+03    5.05E+00
   3.89E+04    3.86E+03    4.65E+00
   5.22E+04    4.47E+03    3.94E+00
   7.02E+04    5.19E+03    3.19E+00
   9.43E+04    6.01E+03    2.58E+00
   1.27E+05    6.97E+03    2.10E+00
   1.70E+05    8.07E+03    1.69E+00
   2.29E+05    9.36E+03    1.34E+00
   3.07E+05    1.08E+04    1.06E+00
   4.12E+05    1.26E+04    8.21E-01
   5.54E+05    1.46E+04    6.35E-01
   7.44E+05    1.69E+04    4.88E-01
   1.00E+06    1.96E+04    3.74E-01