untie (and runtie)

Untie the specified parameter from any links to other parameters.

Syntax: | untie | <param range> |
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where `<param range>` is of the form

`<param range>` ::= `[<modelName>:]<param #>`

For response parameters (see gain command):

runtie | <param range> |
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where `<param range>` is of the form

`<param range>` ::= `[<sourceNum>:]<param #>`

Parameters previously linked together with commands such as

`XSPEC12>newpar <param spec>`

are unlinked. The parameter will retain its current value for the next fit.