diff --git a/articles/Law of large numbers - Wikipedia/Law of large numbers - Wikipedia.xopp.xml b/articles/Law of large numbers - Wikipedia/Law of large numbers - Wikipedia.xopp.xml
index 2daf2d3..e0978e2 100644
--- a/articles/Law of large numbers - Wikipedia/Law of large numbers - Wikipedia.xopp.xml
+++ b/articles/Law of large numbers - Wikipedia/Law of large numbers - Wikipedia.xopp.xml
@@ -3,7 +3,21 @@
Xournal++ document - see https://github.com/xournalpp/xournalpp
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diff --git a/datasets/noise_free_test_images/noise_free_test_images.pdf.txt b/datasets/noise_free_test_images/noise_free_test_images.pdf.txt
new file mode 100644
index 0000000..418418c
--- /dev/null
+++ b/datasets/noise_free_test_images/noise_free_test_images.pdf.txt
@@ -0,0 +1 @@
+https://web.archive.org/web/20221230200626/https://mcolom.perso.math.cnrs.fr/pages/no_noise_images/
diff --git a/datasets/noise_free_test_images/noise_free_test_images.xopp.xml b/datasets/noise_free_test_images/noise_free_test_images.xopp.xml
new file mode 100644
index 0000000..3c672a4
--- /dev/null
+++ b/datasets/noise_free_test_images/noise_free_test_images.xopp.xml
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+ legends not matching actual webpage web-browser rendering
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