diff --git a/articles/Pattern Noise DSNU and PRNU - Learn/Pattern Noise DSNU and PRNU - Learn.xopp.xml b/articles/Pattern Noise DSNU and PRNU - Learn/Pattern Noise DSNU and PRNU - Learn.xopp.xml
index 6a8c32d..cb39c0c 100644
--- a/articles/Pattern Noise DSNU and PRNU - Learn/Pattern Noise DSNU and PRNU - Learn.xopp.xml	
+++ b/articles/Pattern Noise DSNU and PRNU - Learn/Pattern Noise DSNU and PRNU - Learn.xopp.xml	
@@ -29,8 +29,6 @@
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@@ -42,6 +40,11 @@
 dark current (Bruit d&#x2019;obscurit&#xE9;): Certains des &#xE9;lectrons accumul&#xE9;s sur le puits de potentiel r&#xE9;sultent d&#x2019;une cause ther-
 mique. Ces &#xE9;lectrons sont connus sous le nom de courant d&#x2019;obscurit&#xE9;, car ils sont</text>
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@@ -52,31 +55,297 @@ photon shot noise (Bruit photonique (shot noise)):  fluctuations du nombre de ph
 de leur &#xE9;mission ind&#xE9;pendante les uns des autres
 
 Source: https://books.google.fr/books?id=2Ws3EAAAQBAJ&amp;pg=PA24</text>
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+      <text font="Sans" size="11.00000000" x="438.86428019" y="459.20064728" color="#00c0ffff" ts="0" fn="">?</text>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">118.88194783 500.93955621 154.76541236 500.93955621</stroke>
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+      <stroke tool="highlighter" color="#00c0ff7f" width="8.50000000" fill="128">49.75439426 700.96279176 326.17972746 700.96279176</stroke>
+      <text font="Sans" size="11.00000000" x="46.87064362" y="529.27418845" color="#00c0ffff" ts="0" fn="">CMOS: Complementary metal&#x2013;oxide&#x2013;semiconductor </text>
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+      <text font="Sans" size="11.00000000" x="194.28911789" y="741.71610646" color="#00c0ffff" ts="0" fn="">not new thing compared to previous expression, right?</text>
+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">285.75894351 779.38292494 538.54890386 779.38292494</stroke>
+      <text font="Sans" size="11.00000000" x="347.44765926" y="481.54574684" color="#00c0ffff" ts="0" fn="">?</text>
+      <text font="Sans" size="11.00000000" x="6.87797449" y="259.73551013" color="#00c0ffff" ts="0" fn="">see Fig 2 for this line reason</text>
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+    <layer>
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+      <text font="Sans" size="11.00000000" x="56.10138559" y="196.63047748" color="#00c0ffff" ts="0" fn="">and why signal vs response?</text>
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+      <text font="Sans" size="11.00000000" x="53.51785620" y="299.93566647" color="#00c0ffff" ts="0" fn="">I guess talk about random noise in general otherwise the sum cannot converge to 0</text>
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+      <text font="Sans" size="11.00000000" x="405.83047543" y="404.95160531" color="#00c0ffff" ts="0" fn="">some have zeros, no?
+otherwise the offset is not perfect</text>
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+      <text font="Sans" size="11.00000000" x="47.67202674" y="322.16309933" color="#00c0ffff" ts="0" fn="">but then it is not a fixed pattern, no?</text>
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+      <text font="Sans" size="11.00000000" x="48.52238518" y="569.93807532" color="#00c0ffff" ts="0" fn="">why would some pixels have a different temperature than other pixels in the first place?
+Due to circuits or not uniform perceived illumination?</text>
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+      <text font="Sans" size="11.00000000" x="329.25253073" y="462.89450410" color="#00c0ffff" ts="0" fn="">redundant with no illumination?
+does 0 ms exposure makes sense?
+is it a typo?</text>
+      <text font="Sans" size="11.00000000" x="50.32095275" y="732.46370825" color="#00c0ffff" ts="0" fn="">why 0 ms exposure on Fig. 2, then?</text>
+    </layer>
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+      <stroke tool="highlighter" color="#ffff007f" width="8.50000000" fill="128">51.43361838 292.41394731 118.60423874 292.41394731</stroke>
+      <text font="Sans" size="11.00000000" x="43.50897602" y="255.82630055" color="#00c0ffff" ts="0" fn="">so a single scalar for whole image(s)?</text>
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+      <text font="Sans" size="11.00000000" x="489.77330048" y="339.75073040" color="#00c0ffff" ts="0" fn="">?</text>
+      <text font="Sans" size="11.00000000" x="269.23114688" y="365.77314172" color="#00c0ffff" ts="0" fn="">Analog to Digital Units
+https://www.cloudynights.com/topic/417383-what-is-adu/</text>
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