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untie (and runtie)
unlink previously linked parameters
Untie the specified parameter from any links to other parameters.
| Syntax: | untie | <param range> |
|---|
where <param range> is of the form
<param range> ::= [<modelName>:]<param #>
For response parameters (see gain command):
| runtie | <param range> |
|---|
where <param range> is of the form
<param range> ::= [<sourceNum>:]<param #>
Parameters previously linked together with commands such as
XSPEC>newpar <param spec>
are unlinked. The parameter will retain its current value for the next fit.
One exception: a parameter of an ordinary mixing-model component (such as projct or xmmpsf) belonging to a data group other than the lowest cannot be made an independent fit parameter, because only the lowest data group's copy of the component performs the transformation. untie leaves such a parameter tied, with a message explaining why, rather than creating a free parameter that no fit could move. (The recorn mixing model is the exception to the exception: it is applied per data group, so all its copies' parameters are real.)