diff --git a/doc/img/TFHT01B_box.jpg b/doc/img/TFHT01B_box.jpg
new file mode 100644
index 0000000..8828525
Binary files /dev/null and b/doc/img/TFHT01B_box.jpg differ
diff --git a/doc/img/TFHT01B_boxes.jpg b/doc/img/TFHT01B_boxes.jpg
new file mode 100644
index 0000000..3cca407
Binary files /dev/null and b/doc/img/TFHT01B_boxes.jpg differ
diff --git a/doc/img/TFHT01B_stack.jpg b/doc/img/TFHT01B_stack.jpg
new file mode 100644
index 0000000..c70d001
Binary files /dev/null and b/doc/img/TFHT01B_stack.jpg differ