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def align_wcs(wcscat, refcat=None, enforce_user_order=True,
expand_refcat=False, minobj=None, match=TPMatch(),
fitgeom='general', nclip=3, sigma=(3.0, 'rmse')):
r"""
Align (groups of) image catalogs by adjusting the parameters of their
WCS based on fits between matched sources in these catalogs and a reference
catalog which may be automatically created from one of the input ``wcscat``
catalogs.
.. warning::
This function modifies the ``wcs`` attribute of each item
in the input ``wcscat`` list!
Upon completion, this function will add a field ``'fit_info'``
to the ``meta`` attribute of the input WCS correctors (except of the one
chosen as a reference catalog when ``refcat`` is `None`) containing
a dictionary describing matching and fit results. For a description
of the items in this dictionary, see