Pierpaolo Condò

Tied Parameters Break in Compound Models Due to Name Mangling

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### Description When using astropy.modeling, it’s possible to tie parameters within a custom model using lambda functions, e.g. param2.tied = lambda m: 0.5 * m.param1. This works as expected when...

### Description of the Issue When working with light curves that have very fragmented GTIs (e.g. NuSTAR), `rebin()` method on a Lightcurve object can be overly restrictive and discard significant...

Grouping data and optimal binning (Kaastra, Bleeker 2016)

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Is there a way to perform optimal binning of PHA spectra directly within Sherpa? It would be very useful to easily change the grouping of X-ray spectra having all the...