diff --git a/__pycache__/comparator.cpython-37.pyc b/__pycache__/comparator.cpython-37.pyc
new file mode 100644
index 0000000..e38ea18
Binary files /dev/null and b/__pycache__/comparator.cpython-37.pyc differ
diff --git a/comparator.py b/comparator.py
index d2da32b..388923b 100644
--- a/comparator.py
+++ b/comparator.py
@@ -576,6 +576,23 @@ class Comparator(Aggregator, HDF5Container):
                     "emag": U.none,
                 },
             ),
+            "fine_step_from_log": Rule(
+                self,
+                partial(
+                    self._from_log,
+                    ["time", "fine_step", "dt", "a", "mempc1", "mempc2"],
+                    self._extract_fine_step_from_log,
+                ),
+                group="/series",
+                unit={
+                    "time": "unit_time",
+                    "fine_step": U.none,
+                    "dt": "unit_time",
+                    "a": U.none,
+                    "mempc1": U.none,
+                    "mempc2": U.none,
+                },
+            ),
             "turb_power": Rule(
                 self,
                 self._turb_power,