Update app.py

app.py

@@ -313,7 +313,7 @@ if st.session_state['active_card'] == 'card3':
         agg_df_filtered, 
         x='Fy', 
         y='PE_Coeff',  # Differentiate between Promo and NoPromo
-        line_dash='Region',  # Differentiate lines by Region
+        color='Region',  # Differentiate lines by Region
         title=f"Price Elasticity Coefficient (PE) by Year for {selected_item_type}",
         labels={'Fy': 'Fiscal Year', 'PE_Coeff': 'Price Elasticity Coefficient'},
         markers=True