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diff --git a/test_data/images/iris.tests.test_quickplot.TestTimeReferenceUnitsLabels.test_reference_time_units.0.png b/test_data/images/iris.tests.test_quickplot.TestTimeReferenceUnitsLabels.test_reference_time_units.0.png
index 6d0436f..5e247c4 100644
Binary files a/test_data/images/iris.tests.test_quickplot.TestTimeReferenceUnitsLabels.test_reference_time_units.0.png and b/test_data/images/iris.tests.test_quickplot.TestTimeReferenceUnitsLabels.test_reference_time_units.0.png differ