import os
from astropy.utils.data import get_pkg_data_filename
from synphot import SpectralElement
filename = get_pkg_data_filename(
    os.path.join('data', 'hst_acs_hrc_f555w.fits'),
    package='synphot.tests')
bp = SpectralElement.from_file(filename)
bp.plot(left=4000, right=7000)