diff --git a/src/lasp/lasp_measurement.py b/src/lasp/lasp_measurement.py
index f62a8d4..587e421 100644
--- a/src/lasp/lasp_measurement.py
+++ b/src/lasp/lasp_measurement.py
@@ -251,28 +251,27 @@ class Measurement:
 
             self._time = f.attrs['time']
 
+            # Quantity stored as channel.
             self._qtys = None
-            try:
-                qtys_json = f.attrs['qtys']
-                # Load quantity data
-                self._qtys = [Qty.from_json(qty_json) for qty_json in qtys_json] 
-            except KeyError:
-                # If quantity data is not available, this is an 'old'
-                # measurement file.
-                pass
 
             try:
                 qtys_enum_idx = f.attrs['qtys_enum_idx']
                 self._qtys = [SIQtys.fromInt(idx) for idx in qtys_enum_idx]
             except KeyError:
-                pass
+                try:
+                    qtys_json = f.attrs['qtys']
+                    # Load quantity data
+                    self._qtys = [Qty.from_json(qty_json) for qty_json in qtys_json] 
+                except KeyError:
+                    # If quantity data is not available, this is an 'old'
+                    # measurement file.
+                    pass
 
             if self._qtys is None:
                 self._qtys = [SIQtys.default() for i in range(self.nchannels)]
                 logging.debug(f'Physical quantity data not available in measurement file. Assuming {SIQtys.default}')
 
-            
-                logging.debug(f'Physical quantity data not available in measurement file. Assuming {SIQtys.default}')
+
     def setAttribute(self, atrname, value):
         """
         Set an attribute in the measurement file, and keep a local copy in