fix code bug in plot example

Author: keflavich

docs/linelists/cdms/cdms.rst

@@ -158,6 +158,8 @@ shown below:
    from astroquery.linelists.cdms import CDMS
    from scipy.optimize import curve_fit
 
+   result = CDMS.get_species_table()
+   mol = result[result['tag'] == 28503] #do not include signs of TAG for this
    keys = [k for k in mol.keys() if 'lg' in k]
    temp = np.array([float(k.split('(')[-1].split(')')[0]) for k in keys])
    part = list(mol[keys][0])