diff --git a/.gitattributes b/.gitattributes
index b2f4a6e23972bf6dd39042b6acbdfe6270ab2e4e..0e33129f5ccb71ce34f9c8f887e6efe41b1a152a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,3 +1,4 @@
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 *.png filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
diff --git a/external/lab/maintenance-of-fridges/img/img16.PNG b/external/lab/maintenance-of-fridges/img/img16.PNG
deleted file mode 100644
index 7c11ac4c81810db6d255a1240204677b85ef38f4..0000000000000000000000000000000000000000
Binary files a/external/lab/maintenance-of-fridges/img/img16.PNG and /dev/null differ
diff --git a/external/lab/maintenance-of-fridges/img/img16.png b/external/lab/maintenance-of-fridges/img/img16.png
new file mode 100644
index 0000000000000000000000000000000000000000..eff25347cfb48d492b923fc5d1626674467c9fc6
--- /dev/null
+++ b/external/lab/maintenance-of-fridges/img/img16.png
@@ -0,0 +1,3 @@
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+size 3751