diff --git a/ext/dates.png b/ext/dates.png
new file mode 100644
index 0000000..c69bbd1
Binary files /dev/null and b/ext/dates.png differ
diff --git a/ext/formatted_dates.png b/ext/formatted_dates.png
new file mode 100644
index 0000000..4657242
Binary files /dev/null and b/ext/formatted_dates.png differ
diff --git a/ext/multiple_axes.png b/ext/multiple_axes.png
new file mode 100644
index 0000000..c3ff0e5
Binary files /dev/null and b/ext/multiple_axes.png differ