Improve SCS_slowTrain call

src/toolbox_scs/detectors/hrixs.py

@@ -307,12 +307,10 @@ class hRIXS:
         if proposal is None:
             proposal = cls.PROPOSAL
 
-        run, data = tb.load(proposal,
-                            runNB=runNB,
-                            fields=['hRIXS_det', 'SCS_slowTrain'])
+        run, data = tb.load(proposal, runNB=runNB, fields=['hRIXS_det'])
 
         # Get slow train data
-        mnemo = tb.mnemonics['SCS_slowTrain'][0]
+        mnemo = tb.mnemonics_for_run(run)['SCS_slowTrain']
         slow_train = run[mnemo['source'], mnemo['key']].ndarray().sum()
 
         return cls(images=data['hRIXS_det'][1 if first_wrong else 0:].data,