def Morrison(Re):
    r'''Calculates drag coefficient of a smooth sphere using the method in
    [1]_ as described in [2]_.

    .. math::
        C_D = \frac{24}{Re} + \frac{2.6Re/5}{1 + \left(\frac{Re}{5}\right)^{1.52}}
        + \frac{0.411 \left(\frac{Re}{263000}\right)^{-7.94}}{1
        + \left(\frac{Re}{263000}\right)^{-8}} + \frac{Re^{0.8}}{461000}

    Parameters
    ----------
    Re : float
        Particle Reynolds number of the sphere using the surrounding fluid
        density and viscosity, [-]

    Returns
    -------
    Cd : float
        Drag coefficient [-]

    Notes
    -----
    Range is Re <= 1E6.

    Examples
    --------
    >>> Morrison(200.)
    0.767731559965325

    References
    ----------
    .. [1] Morrison, Faith A. An Introduction to Fluid Mechanics.
       Cambridge University Press, 2013.
    .. [2] Barati, Reza, Seyed Ali Akbar Salehi Neyshabouri, and Goodarz
       Ahmadi. "Development of Empirical Models with High Accuracy for
       Estimation of Drag Coefficient of Flow around a Smooth Sphere: An
       Evolutionary Approach." Powder Technology 257 (May 2014): 11-19.
       doi:10.1016/j.powtec.2014.02.045.
    '''
    Cd = (24./Re + 2.6*Re/5./(1 + (Re/5.)**1.52) + 0.411*(Re/263000.)**-7.94/(1 + (Re/263000.)**-8)
    + Re**0.8/461000.)
    return Cd
r'''Calculates drag coefficient of a smooth sphere using the method in
    [1]_ as described in [2]_.

    .. math::
        C_D = \frac{24}{Re} + \frac{2.6Re/5}{1 + \left(\frac{Re}{5}\right)^{1.52}}
        + \frac{0.411 \left(\frac{Re}{263000}\right)^{-7.94}}{1
        + \left(\frac{Re}{263000}\right)^{-8}} + \frac{Re^{0.8}}{461000}

    Parameters
    ----------
    Re : float
        Particle Reynolds number of the sphere using the surrounding fluid
        density and viscosity, [-]

    Returns
    -------
    Cd : float
        Drag coefficient [-]

    Notes
    -----
    Range is Re <= 1E6.

    Examples
    --------
    >>> Morrison(200.)
    0.767731559965325

    References
    ----------
    .. [1] Morrison, Faith A. An Introduction to Fluid Mechanics.
       Cambridge University Press, 2013.
    .. [2] Barati, Reza, Seyed Ali Akbar Salehi Neyshabouri, and Goodarz
       Ahmadi. "Development of Empirical Models with High Accuracy for
       Estimation of Drag Coefficient of Flow around a Smooth Sphere: An
       Evolutionary Approach." Powder Technology 257 (May 2014): 11-19.
       doi:10.1016/j.powtec.2014.02.045.