diff --git a/docs/images/19herst18_image2_PREV.jpg b/docs/images/19herst18_image2_PREV.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..aef0763af7b902440aa1ccadb8281f1b25172967
Binary files /dev/null and b/docs/images/19herst18_image2_PREV.jpg differ
diff --git a/docs/images/19herst18_image3.jpg b/docs/images/19herst18_image3.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..4a023f23757878aee738932fd7bd752649970f75
Binary files /dev/null and b/docs/images/19herst18_image3.jpg differ
diff --git a/docs/images/19herst18_image3_YES.jpg b/docs/images/19herst18_image3_YES.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..1fddcca0d3dbbbe5f83b6f9a58380a0f9f661d3f
Binary files /dev/null and b/docs/images/19herst18_image3_YES.jpg differ
diff --git a/docs/images/19herst18_image4.jpg b/docs/images/19herst18_image4.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..3dcb52dfdfb3e08967a2db44ef970da98a137a17
Binary files /dev/null and b/docs/images/19herst18_image4.jpg differ