FReeze
FReeze [plist]
Can only be used after a model has been defined. This command
causes all parameters listed in "[plist]" to be frozen, which means
the parameter value is not allowed to vary during a "Fit".
examples
PLT> FReeze 2 ! Freeze the value of parameter 2
PLT> FReeze 3..5 9 ! Freeze the values of parameters 3 through 5 and 9
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