diff --git a/src/cr39py/models/response.py b/src/cr39py/models/response.py
index c29f5a9..d174185 100644
--- a/src/cr39py/models/response.py
+++ b/src/cr39py/models/response.py
@@ -144,7 +144,6 @@ def _scaled_diameter_curve(self, E: np.ndarray) -> np.ndarray:
     def _M(self):
         """
         A parameter used along with dmax to scale diameters.
-
         """
         # Eq. B6 of Lahmann et al.
         if self.dmax < 12.5: