The :command:`make_passband` tool reads response data, and writes them to a :f-schema:`passband` file. It accepts the following command-line arguments:
.. program:: make_passband
.. option:: <input_file_name> Name of input file (see below).
.. option:: <F_0>
Normalizing flux :math:`F_{0}` (:math:`\erg\,\cm^{-2}\,\second^{-1}\,\angstrom^{-1}`).
.. option:: <passband_file_name> Name of output :f-schema:`passband` file.
The input file is a text file tabulating wavelength \lambda (\angstrom) and passband response function S'(\lambda) (see the :ref:`photometric-colors` section).