@spiceErrorCheck<EOL>def wnunid(a, b):
assert isinstance(a, stypes.SpiceCell)<EOL>assert b.dtype == <NUM_LIT:1><EOL>assert isinstance(b, stypes.SpiceCell)<EOL>assert a.dtype == <NUM_LIT:1><EOL>c = stypes.SpiceCell.double(b.size + a.size)<EOL>libspice.wnunid_c(ctypes.byref(a), ctypes.byref(b), ctypes.byref(c))<EOL>return c<EOL>
Place the union of two double precision windows into a third window.

http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/wnunid_c.html

:param a: Input window A. 
:type a: spiceypy.utils.support_types.SpiceCell
:param b: Input window B. 
:type b: spiceypy.utils.support_types.SpiceCell
:return: Union of a and b.
:rtype: spiceypy.utils.support_types.SpiceCell