""" Module containing independently written code to calculate galaxy-galaxy lensing,
used in the unit-testing of `~halotools.mock_observables.surface_density` sub-package.
"""
from __future__ import absolute_import, division, print_function, unicode_literals


__all__ = ('external_delta_sigma', )
__author__ = ('Surhud More', )


def external_delta_sigma(*args, **kwargs):
    """
    """
    pass
