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thaw: allow fixed parameters to vary.

Allow indicated parameters to vary. (See also freeze).

Syntax:           thaw{[ <param range>...]}


<param range> =:: [modelName:]<param #> | <param #>-- <param #>

For response parameters (see gain command):

                        rthaw {[ <param range>...]}


<param range> =:: [sourceNum:]<param #> | <param #>-- <param #>


The indicated parameter, or range of parameters, will be marked as variable by the fitting commands and treated as a fitting parameter in subsequent fits. By default, the range will be the last range input by either a freeze or thaw command. See the freeze examples for an example of the use of the thaw command.