def straight_throat(target, throat_centroid='throat.centroid',
                    throat_vector='throat.vector',
                    throat_length='throat.length'):
    r"""
    Calculate the coordinates of throat endpoints given a central coordinate,
    unit vector along the throat direction and a length.

    Parameters
    ----------
    target : OpenPNM Object
        The object which this model is associated with. This controls the
        length of the calculated array, and also provides access to other
        necessary properties.

    throat_centroid : string
        Dictionary key of the throat center coordinates.

    throat_vector : string
        Dictionary key of the throat vector pointing along the length of the
        throats.

    throat_length : string
        Dictionary key of the throat length.

    Returns
    -------
    EP : dictionary
        Coordinates of throat endpoints stored in Dict form. Can be accessed
        via the dict keys 'head' and 'tail'.
    """
    network = target.project.network
    throats = network.map_throats(throats=target.Ts, origin=target)
    center = network[throat_centroid][throats]
    vector = network[throat_vector][throats]
    length = network[throat_length][throats]
    EP1 = center - 0.5 * length[:, _sp.newaxis] * vector
    EP2 = center + 0.5 * length[:, _sp.newaxis] * vector
    return {'head': EP1, 'tail': EP2}
r"""
    Calculate the coordinates of throat endpoints given a central coordinate,
    unit vector along the throat direction and a length.

    Parameters
    ----------
    target : OpenPNM Object
        The object which this model is associated with. This controls the
        length of the calculated array, and also provides access to other
        necessary properties.

    throat_centroid : string
        Dictionary key of the throat center coordinates.

    throat_vector : string
        Dictionary key of the throat vector pointing along the length of the
        throats.

    throat_length : string
        Dictionary key of the throat length.

    Returns
    -------
    EP : dictionary
        Coordinates of throat endpoints stored in Dict form. Can be accessed
        via the dict keys 'head' and 'tail'.