@spiceErrorCheck<EOL>def wnfetd(window, n):
assert isinstance(window, stypes.SpiceCell)<EOL>assert window.dtype == <NUM_LIT:1><EOL>n = ctypes.c_int(n)<EOL>left = ctypes.c_double()<EOL>right = ctypes.c_double()<EOL>libspice.wnfetd_c(ctypes.byref(window), n, ctypes.byref(left),<EOL>ctypes.byref(right))<EOL>return left.value, right.value<EOL>
Fetch a particular interval from a double precision window.

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

:param window: Input window 
:type window: spiceypy.utils.support_types.SpiceCell
:param n: Index of interval to be fetched. 
:type n: int
:return: Left, right endpoints of the nth interval.
:rtype: tuple