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.