IALPHA=0: 
is used. Where SIGMA is a token.
IALPHA=1: 
's are calculated in the program.
and 
depend on kappa.
The canonical 's only applies for kappa=0. Optimal 's
(leading to screening for non-zero kappa's) have been calculated
as a function of kappa and a fit formula has been found. This is used
to calculate the 's.
IALPHA=2: (token ALPHA) and (token ADOT)
must be supplied in the CTRL file.