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  {
   "cell_type": "markdown",
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   "source": [
    "# Compare with experiment\n",
    "\n",
    "For any help, refer to [RADIS documentation](https://radis.readthedocs.io) \n",
    "\n",
    "In particular, see: [calc_spectrum](https://radis.readthedocs.io/en/latest/source/radis.lbl.calc.html#radis.lbl.calc.calc_spectrum), [Spectrum](https://radis.readthedocs.io/en/latest/source/radis.spectrum.spectrum.html#radis.spectrum.spectrum.Spectrum), [plot_diff](https://radis.readthedocs.io/en/latest/source/radis.spectrum.compare.html#radis.spectrum.compare.plot_diff) \n",
    "\n",
    "---"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# We use widget \n",
    "%matplotlib widget\n",
    "from radis import calc_spectrum, Spectrum, plot_diff\n",
    "from astropy import units as u\n",
    "\n",
    "# A first example. \n",
    "s = calc_spectrum(1900 / u.cm, 2300 / u.cm,\n",
    "                  molecule='CO',\n",
    "                  isotope='1,2,3',\n",
    "                  pressure=1.01325 * u.bar,\n",
    "                  Tgas=700 * u.K,\n",
    "                  mole_fraction=0.1,\n",
    "                  path_length=1 * u.cm,\n",
    "                  verbose=False\n",
    "                  )\n",
    "s.apply_slit(1, 'nm')\n",
    "s.plot('transmittance')\n",
    "# Update, or add your code below\n",
    "# ... "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Import an experimental spectrum : \n",
    "s_exp = Spectrum.from_txt('my_experiment.txt', 'transmittance', unit='', waveunit='nm')        # or import with numpy and use Spectrum.from_array()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "plot_diff(s_exp, s)"
   ]
  }
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