Allows FLT masking to be switched off after a given number of iterations

If flt.zero_niter is non-zero, it gives the number of iterations for which the FLT model should be masked.
Subsequent iterations are not masked. A value of zero means

`"`

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. [2] - Type:

MAKEMAP,
CALCQU

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East Asian Observatory

East Asian Observatory