diff --git a/doc/JPG/sinusoid.jpg b/doc/JPG/sinusoid.jpg new file mode 100644 index 0000000000..00969281a1 Binary files /dev/null and b/doc/JPG/sinusoid.jpg differ diff --git a/doc/JPG/sinusoid_small.jpg b/doc/JPG/sinusoid_small.jpg new file mode 100644 index 0000000000..1643d81698 Binary files /dev/null and b/doc/JPG/sinusoid_small.jpg differ