Allows FLT masking to be switched off after a given number of iterations FLT.ZERO_NITER
"
mask on all
iterations"
. However, if parameter "
flt.zero_notlast"
is set, the mask will will not be applied on the
last iteration, even if flt.zero_niter is zero. Note, using FLT masking on many iterations can inhibit
convergence. Also, any initial iterations specified by parameter "
ast.skip"
are not included in the
count of iterations. A negative value will disable all masking of the FLT model. This parameter
controls the masking requested via parameter "
flt.clip"
, in addition to the masking requested via the
"
flt.zero_xxx"
set of parameters. [2]