def basic_mesa_f_files(mesa_dir):
    """
    Returns list of selected MESA .f90 files & standard_run_star_extras.
    These ones provide a nice skeleton of each timestep.
    """
    basic_files = ['public/star_lib.f90',
                   'job/run_star.f90',
                   'job/run_star.f',
                   'job/run_star_support.f90',
                   'private/evolve.f90']
    basic_files = [mesa_dir + '/star/' + x for x in basic_files]
    basic_files.append(mesa_dir + '/include/standard_run_star_extras.inc')
    return basic_files