diff --git a/slides/figs/taux_change.pdf b/slides/figs/taux_change.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..19d6d68a51bc6b1717dd454c4d75540ddff54bca
Binary files /dev/null and b/slides/figs/taux_change.pdf differ
diff --git a/slides/figs/taux_change_graphe.pdf b/slides/figs/taux_change_graphe.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..80a2744c7c35b763cce84ee958db62e2adc6cd9e
Binary files /dev/null and b/slides/figs/taux_change_graphe.pdf differ
diff --git a/slides/figs/taux_change_graphe_log.pdf b/slides/figs/taux_change_graphe_log.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..86800b31414bdfd58a0122eb5f7dccb95fc96540
Binary files /dev/null and b/slides/figs/taux_change_graphe_log.pdf differ