def wnfetd(window, n):
    """
    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
    """
    assert isinstance(window, stypes.SpiceCell)
    assert window.dtype == 1
    n = ctypes.c_int(n)
    left = ctypes.c_double()
    right = ctypes.c_double()
    libspice.wnfetd_c(ctypes.byref(window), n, ctypes.byref(left),
                      ctypes.byref(right))
    return left.value, right.value
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