Re: using tie-to

Hi,

> I'm trying to fit the spectral continuum with two different xspec 
> models: phabs and pfcabs. Both of these models have as a constraint 
> the hydrogen density. What I would like to do is tie these two 
> parameters together since they should always be the same, but I don't
> know if that's possible.

The function you're asking for is actually called "tie"... ;-)
So you can do:
    tie("phabs(1).nH", "pcfabs(1).nH");
Now, pcfabs(1).nH is no more allowed to vary individually.

Btw, with the set_par_fun function, one can realize even more
complicated parameter dependencies.

Cheers,

Manfred


P.S.
Ops, Dan was already faster.
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