Update sob_terms.py

Author: jasonfan1997

mla/threeml/sob_terms.py

@@ -150,7 +150,7 @@ def _build_ow_hist(self) -> np.ndarray:
 
     def get_ns(self) -> float:
         """Docstring"""
-        return (self.spectrum(self._ow_ebin) * self._ow_hist *).sum() * self._unit_scale
+        return (self.spectrum(self._ow_ebin) * self._ow_hist).sum() * self._unit_scale
 
     def _init_bg_sob_map(self) -> np.ndarray:
         """Docstring"""