color-excess: update synphot call

Author: jeffjennings

tutorials/color-excess/color-excess.ipynb

@@ -73,7 +73,7 @@
     "from astropy.table import Table\n",
     "from dust_extinction.parameter_averages import CCM89, F99\n",
     "from synphot import units, config\n",
-    "from synphot import SourceSpectrum,SpectralElement,Observation,ExtinctionModel1D\n",
+    "from synphot import SourceSpectrum,SpectralElement,Observation,ReddeningLaw\n",
     "from synphot.models import BlackBodyNorm1D\n",
     "from synphot.spectrum import BaseUnitlessSpectrum\n",
     "from synphot.reddening import ExtinctionCurve\n",
@@ -540,8 +540,7 @@
     "wav = np.arange(0.1, 3, 0.001)*u.micron\n",
     "\n",
     "# Make the extinction model in synphot using a lookup table.\n",
-    "ex = ExtinctionCurve(ExtinctionModel1D, \n",
-    "                     points=wav, lookup_table=ext.extinguish(wav, Av=Av))\n",
+    "ex = ReddeningLaw(ext).extinction_curve(Av / ext.Rv, wavelengths=wav)\n",
     "sp_ext = sp_norm*ex\n",
     "sp_ext.plot(left=1, right=15000, flux_unit='flam',\n",
     "            title='Normed Blackbody with Extinction')"