diff --git a/doc/figs/ladder.png b/doc/figs/ladder.png
index b1f2e719..abce1802 100644
Binary files a/doc/figs/ladder.png and b/doc/figs/ladder.png differ
diff --git a/doc/figs/ladder.svg b/doc/figs/ladder.svg
index 82eed77b..000ef802 100644
--- a/doc/figs/ladder.svg
+++ b/doc/figs/ladder.svg
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