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+from __future__ import absolute_import, print_function # confidence high
+
+from .altwcs import *
+from .hstwcs import HSTWCS
+
+
+def help():
+ doc = """ \
+ 1. Using a `astropy.io.fits.HDUList` object and an extension number \n
+ Example:\n
+ from astropy.io improt fits
+ fobj = fits.open('some_file.fits')\n
+ w = wcsutil.HSTWCS(fobj, 3)\n\n
+
+ 2. Create an HSTWCS object using a qualified file name. \n
+ Example:\n
+ w = wcsutil.HSTWCS('j9irw4b1q_flt.fits[sci,1]')\n\n
+
+ 3. Create an HSTWCS object using a file name and an extension number. \n
+ Example:\n
+ w = wcsutil.HSTWCS('j9irw4b1q_flt.fits', ext=2)\n\n
+
+ 4. Create an HSTWCS object from WCS with key 'O'.\n
+ Example:\n
+
+ w = wcsutil.HSTWCS('j9irw4b1q_flt.fits', ext=2, wcskey='O')\n\n
+
+ 5. Create a template HSTWCS object for a DEFAULT object.\n
+ Example:\n
+ w = wcsutil.HSTWCS(instrument='DEFAULT')\n\n
+ """
+
+ print('How to create an HSTWCS object:\n\n')
+ print(doc)