add super-special code for the MTE3

the MTE3 is train-tagged too late, we need to date to the TPI.

src/toolbox_scs/load.py

@@ -171,7 +171,24 @@ def load(proposalNB=None, runNB=None,
             log.warning(f'Source {v["source"]} not found in run. Skipping!')
             print(f'Source {v["source"]} not found in run. Skipping!')
             continue
-        if k not in rois:
+        if k == 'MTE3':
+            arr = run.get_array(v['source'], v['key'],
+                                extra_dims=v['dim'], name=k)
+            tpi = run.get_array('SCS_XTD10_TPI/DCTRL/SHUTTER',
+                                'hardwareStatusBitField.value', name=k)
+            tpi_open = iter(tpi.trainId[tpi & (1 << 12) > 0])
+
+            mte3_tids = []
+            last = 0
+            current = next(tpi_open)
+            for tid in arr.trainId:
+                 while current < tid:
+                     last = current
+                     current = next(tpi_open, tid)
+                 mte3_tids.append(last)
+            data_arrays.append(
+                arr.assign_coords(trainId=np.array(mte3_tids, dtype='u8')))
+        elif k not in rois:
             # no ROIs selection, we read everything
             arr = run.get_array(v['source'], v['key'],
                                 extra_dims=v['dim'], name=k)