diff --git a/articles/Noise reduction - Wikipedia/Noise reduction - Wikipedia.xopp.xml b/articles/Noise reduction - Wikipedia/Noise reduction - Wikipedia.xopp.xml
index 2b3593d..7f46c11 100644
--- a/articles/Noise reduction - Wikipedia/Noise reduction - Wikipedia.xopp.xml
+++ b/articles/Noise reduction - Wikipedia/Noise reduction - Wikipedia.xopp.xml
@@ -56,15 +56,229 @@
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+ unclear what external means
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+ ?
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+
-
+
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+ ?
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+ ?
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+ ?
+ example?
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+ pixel is more appropriate, no?
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+ proportional?
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+ a bit unclear
+ to check
+ should investigate
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+