Removed accidental use of wrong time weighting for impulse (35 ms).

python_src/lasp/lasp_slm.py

@@ -57,6 +57,9 @@ class SLM:
             level_ref_value: Reference value for computing the levels in dB
             offset_t: Offset to be added to output time data [s]
             """
+        
+        if tw == TimeWeighting.ufast:
+            raise RuntimeError('The current implementation of impulse time weigthing is incorrect, as it does not have the proper decay time constant.')
 
         self.fbdesigner = fbdesigner
         if xmin is None and fbdesigner is not None: