def get_ethinca_orders():
    """
    Returns the dictionary mapping TaylorF2 PN order names to twice-PN
    orders (powers of v/c)
    """
    ethinca_orders = {'zeroPN': 0, 'onePN': 2, 'onePointFivePN': 3, 'twoPN':
        4, 'twoPointFivePN': 5, 'threePN': 6, 'threePointFivePN': 7}
    return ethinca_orders
