diff --git a/img/gadfly_example_1.png b/img/gadfly_example_1.png
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diff --git a/img/gadfly_example_3.png b/img/gadfly_example_3.png
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diff --git a/img/gadfly_example_4.png b/img/gadfly_example_4.png
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diff --git a/img/gadfly_example_5.png b/img/gadfly_example_5.png
index a527e175..80d0bcac 100644
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diff --git a/img/qwt_example_1.png b/img/qwt_example_1.png
index 182ecd92..e3aad7a0 100644
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diff --git a/img/qwt_example_3.png b/img/qwt_example_3.png
index 8df52204..485da862 100644
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diff --git a/img/qwt_example_4.png b/img/qwt_example_4.png
index 651dbab3..30cd6e05 100644
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diff --git a/img/qwt_example_5.png b/img/qwt_example_5.png
index 6938c6ad..0268664a 100644
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