diff --git a/docs/sphinx/sources/draw_io_resources/README.txt b/docs/sphinx/sources/draw_io_resources/README.txt
new file mode 100644
index 0000000..9607545
--- /dev/null
+++ b/docs/sphinx/sources/draw_io_resources/README.txt
@@ -0,0 +1,3 @@
+Draw.IO is an online editor free to use based on the mxGraph.
+The files which are stored in this folder can be imported into draw.io and edited.
+The graphics used in the docs are generated with this online editor.
diff --git a/docs/sphinx/sources/images/flow.xml b/docs/sphinx/sources/draw_io_resources/flow.xml
similarity index 100%
rename from docs/sphinx/sources/images/flow.xml
rename to docs/sphinx/sources/draw_io_resources/flow.xml
diff --git a/docs/sphinx/sources/draw_io_resources/n1.xml b/docs/sphinx/sources/draw_io_resources/n1.xml
new file mode 100644
index 0000000..19a24f7
--- /dev/null
+++ b/docs/sphinx/sources/draw_io_resources/n1.xml
@@ -0,0 +1 @@
+<mxfile userAgent="Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0" version="6.8.12" editor="www.draw.io" type="device"><diagram id="7f6e8a9c-1b8a-000d-2b9d-ce9fc220e857" name="Page-1">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</diagram></mxfile>
\ No newline at end of file
diff --git a/docs/sphinx/sources/images/n2.xml b/docs/sphinx/sources/draw_io_resources/n2.xml
similarity index 100%
rename from docs/sphinx/sources/images/n2.xml
rename to docs/sphinx/sources/draw_io_resources/n2.xml
diff --git a/docs/sphinx/sources/images/n3.xml b/docs/sphinx/sources/draw_io_resources/n3.xml
similarity index 100%
rename from docs/sphinx/sources/images/n3.xml
rename to docs/sphinx/sources/draw_io_resources/n3.xml
diff --git a/docs/sphinx/sources/images/heatmap/n1_example.jpeg b/docs/sphinx/sources/images/heatmap/n1_example.jpeg
index 35fbfe1..8ebc716 100644
Binary files a/docs/sphinx/sources/images/heatmap/n1_example.jpeg and b/docs/sphinx/sources/images/heatmap/n1_example.jpeg differ
diff --git a/docs/sphinx/sources/images/n1.xml b/docs/sphinx/sources/images/n1.xml
deleted file mode 100644
index 7ebe21e..0000000
--- a/docs/sphinx/sources/images/n1.xml
+++ /dev/null
@@ -1 +0,0 @@
-<mxfile userAgent="Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:54.0) Gecko/20100101 Firefox/54.0" version="6.8.12" editor="www.draw.io" type="device"><diagram id="7f6e8a9c-1b8a-000d-2b9d-ce9fc220e857" name="Page-1">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</diagram></mxfile>
\ No newline at end of file