Update app.py

app.py

@@ -277,7 +277,7 @@ elif app_section == "Model Performance & Diagnostics":
         col1, col2 = st.columns(2)
         with col1:
             fig_rmse = diag.plot_performance_degradation(
-                perf_df, 
+                champion_perf_dfperf_df, 
                 metric_column=RMSE_COL_NAME, 
                 metric_name='RMSE (Temperature °C)',
                 color='blue'
@@ -285,7 +285,7 @@ elif app_section == "Model Performance & Diagnostics":
             st.plotly_chart(fig_rmse, use_container_width=True)
         with col2:
             fig_r2 = diag.plot_performance_degradation(
-                perf_df, 
+                champion_perf_df, 
                 metric_column=R2_COL_NAME, 
                 metric_name='R-squared (R²)',
                 color='green'