diff --git a/img/gadfly_example_7.png b/img/gadfly_example_7.png
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index 00000000..2dd3e944
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diff --git a/img/qwt_example_7.png b/img/qwt_example_7.png
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index 00000000..3e5c5880
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diff --git a/img/qwt_example_8.png b/img/qwt_example_8.png
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