Zineb Aly
--- a/km3io/offline.py
+++ b/km3io/offline.py
            Constructor = namedtuple(attribute, fields)
            if len(values) < len(fields):
                values += [None] * (len(fields) - len(values))
+            print(attribute, fields, values)
            self._data[attribute] = Constructor(
                **{f: _to_num(v)
                   for (f, v) in zip(fields, values)})

+        # quick fix while waiting for additional definitions in mc_header
+        for key in self._missing_keys:
+            self._data[key] = _to_num(header[key])
--- a/tests/test_offline.py
+++ b/tests/test_offline.py
        assert np.allclose(
            [37.51967774166617, -10.280346193553832, 13.67595659707355],
            self.f.events.usr.DeltaPosZ)
+
+
+class TestIndependentFunctions(unittest.TestCase):