I compared three formulas:

Regge Theory:
Found in physical review D, part I, 1 aug 1994, pg 1335, table 33.2

CERN-HERA-COMPAS least squares fits:
Found in physical review D, part I, 1 aug 1994, pg 1335, table 33.3

P. Shukla: Found in 'Glauber Model for Heavy Ion Collisions From Low Energies To High Energies', pg. 8
Note: He gives proton-proton cross section as function of beta_projectile in the lab frame in units of fm² and the neutron-proton cross section as a funtion of center of mass beta in units of barns.


Here is a plot comparing the three formulas, this time all in the same units.