In physics.py after calculating the bootstrap current fraction there is a condition to check if the calculated value is greater than bscfmax . If this is true the bootstrap current value is overwritten completely neglecting the model. This will also call the level 2 error number 242 (""PHYSICS: Bootstrap fraction upper limit enforced")

This is a non-physical condition and should be better managed with a new constraint equation as in some cases the bootstrap scaling's give values greater than unity.

Bootstrap fraction (ITER 1989)                                           (bscf_iter89)                 0.403  OP 
Bootstrap fraction (Sauter et al)                                        (bscf_sauter)                 0.994  OP 
Bootstrap fraction (Nevins et al)                                        (bscf_nevins)                 1.038  OP 
Bootstrap fraction (Wilson)                                              (bscf_wilson)                 1.090  OP 
 
Bootstrap fraction                                                       (bootipf)                     0.900  OP

The above is for the output of the st_regression.IN.DAT in this case bscfmax = 0.9 and the Sauter scaling is used.
The difference is a factor of 10% as PROCESS has overridden the value from the model.