diff --git a/examples/high_frequency/radiofrequency_mmwave/iris_filter.py b/examples/high_frequency/radiofrequency_mmwave/iris_filter.py
index a0df6a421..f2f5a62bf 100644
--- a/examples/high_frequency/radiofrequency_mmwave/iris_filter.py
+++ b/examples/high_frequency/radiofrequency_mmwave/iris_filter.py
@@ -242,7 +242,7 @@ def place_iris(z_pos, dz, param_count):
 report = hfss.post.create_report(traces_to_plot)  # Creates a report in HFSS
 solution = report.get_solution_data()
 
-plt = solution.plot(solution.expressions)  # Matplotlib axes object.
+plt = solution.plot(solution.expressions, formula="dB20")  # Matplotlib axes object.
 # -
 
 #  The following command generates a field plot in HFSS and uses PyVista