diff --git a/figs/lab_8.1.png b/figs/lab_8.1.png
new file mode 100644
index 000000000..2bc1fad3e
Binary files /dev/null and b/figs/lab_8.1.png differ
diff --git a/figs/lab_8.2.png b/figs/lab_8.2.png
new file mode 100644
index 000000000..e518cd28e
Binary files /dev/null and b/figs/lab_8.2.png differ
diff --git a/figs/lab_8.3.png b/figs/lab_8.3.png
new file mode 100644
index 000000000..9172060b2
Binary files /dev/null and b/figs/lab_8.3.png differ
diff --git a/figs/lab_8.4.png b/figs/lab_8.4.png
new file mode 100644
index 000000000..e58015ce3
Binary files /dev/null and b/figs/lab_8.4.png differ