Source table  (`~astropy.table.Table`).

        Columns: GLON, GLAT, COUNTS

def source_table(self):
        """Source table  (`~astropy.table.Table`).

        Columns: GLON, GLAT, COUNTS
        """
        url = 'https://github.com/gammapy/gammapy-extra/raw/master/datasets/fermi_2fhl/gll_psch_v08.fit.gz'
        table = Table.read(url, hdu='2FHL Source Catalog')
        table.rename_column('Npred', 'COUNTS')
        table.keep_columns(['GLON', 'GLAT', 'COUNTS'])
        table.meta.clear()
        return table