FACIMP - Error tolerance for inner loop elliptic equation solver.
If FACIMP is negative, 
will be used as the
error tolerance, and will be divided by 5 at each grid doubling. This
can be useful in removing glitches in 
near the axis caused by
an insufficient number of iterations following grid size doubling.
NIMAX - Maximum number of inner iterations before metric update.
ITOOFF - Number of iterations which use fit at origin.
JORGN - 
surface number at which fit is made for iterations < ITOOFF.
TSAW - Sawtooth parameter for temperature profile.
() = TSAW 
T() + (1-TSAW) T(
).
ESAW - Sawtooth parameter for Taylor state current profile.
= ESAW 
+ (1-ESAW) 
(
).
RSAW - Relaxation parameter for sawtooth model.