[spec] tidy up remaining collated notes

diff --git a/spec/graphics/second-derivatives.png b/spec/graphics/second-derivatives.png
index 3323f4036e2dc8d1ed2efd291f764116cd2d4ead..71602ce6c36d4d96d38a5705b5c86f9dec165e74 100644 (file)
Binary files a/spec/graphics/second-derivatives.png and b/spec/graphics/second-derivatives.png differ