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+.help skdecwstr Mar00 Skywcs
+.ih
+NAME
+skdecwstr -- open a sky coordinate descriptor using a system name
+.ih
+SYNOPSIS
+stat = sk_decwstr (csystem, coo, imcoo)
+
+.nf
+char	csystem		# the input celestial coordinate system name
+pointer	coo		# the output sky coordinate descriptor
+pointer	imcoo		# the input image sky coordinate descriptor 
+.fi
+.ih
+ARGUMENTS
+.ls  csystem 
+The sky coordinates definition. Ccsystem is a system name,  e.g. "J2000"
+or "galactic".
+.le
+.ls coo
+The output sky coordinate descriptor.
+.le
+.ls imcoo
+The parent image coordinate descriptor. Imcoo is set to NULL
+except in cases where the sky coordinate descriptor for an image is
+transformed and written back to the same image.
+.le
+.ih
+DESCRIPTION
+Sk_decwstr is an integer function which returns OK or ERR as its function
+value. ERR is returned if a valid sky coordinate system cannot be opened,
+OK otherwise.
+
+Sk_decwstr returns the sky descriptor coo. The sky coordinate descriptor
+is defined even if an error is detected in reading the image celestial
+coordinate system, and must be freed with a call to sk_close before
+task termination.
+
+.ih
+NOTES
+
+Type "help ccsystems" to get a list of the supported sky coordinate systems.
+
+SEE ALSO
+skdecwcs, skdecim, skcopy, skclose
+.endhelp