diff --git a/mlair/run_modules/post_processing.py b/mlair/run_modules/post_processing.py
index 7bc60fb063492bb6cb72c785302ed42324b8b488..304f004c7e4c904cc75f62f294920562b87258a7 100644
--- a/mlair/run_modules/post_processing.py
+++ b/mlair/run_modules/post_processing.py
@@ -978,7 +978,6 @@ class PostProcessing(RunEnvironment):
         sector_skill_scores = sector_skill_scores.assign_attrs({f"reference_model": ref_name})
         return sector_skill_scores
 
-
     def calculate_error_metrics(self) -> Tuple[Dict, Dict, Dict, Dict]:
         """
         Calculate error metrics and skill scores of NN forecast.