diff --git a/optika/sensors/_materials/_e2v_ccd97/_e2v_ccd97.py b/optika/sensors/_materials/_e2v_ccd97/_e2v_ccd97.py
index 5689c98..c7534c4 100644
--- a/optika/sensors/_materials/_e2v_ccd97/_e2v_ccd97.py
+++ b/optika/sensors/_materials/_e2v_ccd97/_e2v_ccd97.py
@@ -156,5 +156,3 @@ def thickness_substrate(self) -> u.Quantity:
     @property
     def cce_backsurface(self) -> float:
         return self._quantum_efficiency_fit["cce_backsurface"]
-
-
diff --git a/optika/sensors/_materials/_materials.py b/optika/sensors/_materials/_materials.py
index 87faaf1..d8db082 100644
--- a/optika/sensors/_materials/_materials.py
+++ b/optika/sensors/_materials/_materials.py
@@ -534,6 +534,3 @@ def transmissivity(
             rays=rays,
             normal=normal,
         )
-
-
-