diff --git a/src/figures/bode.png b/src/figures/bode.png
index 195b67b..0017478 100644
Binary files a/src/figures/bode.png and b/src/figures/bode.png differ
diff --git a/src/figures/gangoffour.png b/src/figures/gangoffour.png
index 50018df..ff191c2 100644
Binary files a/src/figures/gangoffour.png and b/src/figures/gangoffour.png differ
diff --git a/src/figures/impulse.png b/src/figures/impulse.png
index bf73abf..0f44ae6 100644
Binary files a/src/figures/impulse.png and b/src/figures/impulse.png differ
diff --git a/src/figures/lsim.png b/src/figures/lsim.png
index da777ca..6ab0826 100644
Binary files a/src/figures/lsim.png and b/src/figures/lsim.png differ
diff --git a/src/figures/margin.png b/src/figures/margin.png
index 2bf9261..1da22f2 100644
Binary files a/src/figures/margin.png and b/src/figures/margin.png differ
diff --git a/src/figures/nichols.png b/src/figures/nichols.png
index 4c25591..4bf1c65 100644
Binary files a/src/figures/nichols.png and b/src/figures/nichols.png differ
diff --git a/src/figures/nyquist.png b/src/figures/nyquist.png
index 0590665..a25c5d0 100644
Binary files a/src/figures/nyquist.png and b/src/figures/nyquist.png differ
diff --git a/src/figures/pzmap.png b/src/figures/pzmap.png
index e4196a6..492b693 100644
Binary files a/src/figures/pzmap.png and b/src/figures/pzmap.png differ
diff --git a/src/figures/rlocus.png b/src/figures/rlocus.png
index 40577aa..fba80e7 100644
Binary files a/src/figures/rlocus.png and b/src/figures/rlocus.png differ
diff --git a/src/figures/sigma.png b/src/figures/sigma.png
index 27f2ef9..0d39112 100644
Binary files a/src/figures/sigma.png and b/src/figures/sigma.png differ
diff --git a/src/figures/step.png b/src/figures/step.png
index 0f8b0f6..c741f66 100644
Binary files a/src/figures/step.png and b/src/figures/step.png differ