The reduced B14 2-site CPMG model

This is the model for 2-site exchange exact analytical derivation on all time scales (with the constraint that p_A > p_B), named after Baldwin (2014). It is selected by setting the model to `B14'. It is the same as the full B14 model described above, but with the simplification that R_2A⁰ = R_2B⁰.

More information about the B14 model is available from:

• the relax wiki at http://wiki.nmr-relax.com/B14,
• the API documentation at http://www.nmr-relax.com/api/3.2/lib.dispersion.b14-module.html,
• the relaxation dispersion page of the relax website at http://www.nmr-relax.com/analyses/relaxation_dispersion.html#B14.