diff --git a/ChangeLog b/ChangeLog
index 1827d24f70fec79cdb4d737aa72b06663d3c0638..039af064ffef64672660f239661e97b07fe2e244 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,26 @@
+2015-04-02  Richard Larsson  <ric.larsson@gmail.com>
+
+	* ARTS-XML-DATA-2-3-5
+	
+	Moved Perrin data to Artscat-5 format.  The old combination
+	of Artscat-3 and Artscat-4 are still available under 
+	Perrin_artscat34.  This is kept because we are still not
+	reading the qunatum numbers of Artscat-4 fully, so the numbers
+	are lost in the conversion to Artscat-5.
+	
+	* spectroscopy/Perrin:  Used abs_linesArtscat5FromArtscat34 on
+	an abs_lines containing all lines in old spectroscopy/Perrin/.
+	Then used abs_lines_per_speciesWriteToSplitArtscat to write these
+	back to files.  Manually copied all empty files and altered their
+	format to Artscat-5.  The result is a split Artscat5 catalog tree
+	with the same content as before.
+	
+	make check in Arts is succesful even after the change.
+	
+	* spectroscopy/Perrin_artscat34:  Copy of Artscat-3 and Artscat-4
+	Perrin catalog tree.  This is what you had before the update to this
+	version.
+
 2014-12-10 Jana Mendrok <jana.mendrok@ltu.se>
 
 	* ARTS-XML-DATA-2-3-4
diff --git a/spectroscopy/Perrin/C2H2.xml.gz b/spectroscopy/Perrin/C2H2.xml.gz
index 5c6addbef3ae5c324b987db2b6ffc27abfe3638d..336210c4dadfdf6a8de61d8d7bb50eb66617cac8 100644
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diff --git a/spectroscopy/Perrin/C2H4.xml.gz b/spectroscopy/Perrin/C2H4.xml.gz
index bf2f651f86f34c84c159ae2cb11d7d689176739c..37c1c7fa1caafacb3803cf451efc712b23417f05 100644
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diff --git a/spectroscopy/Perrin/C2H6.xml.gz b/spectroscopy/Perrin/C2H6.xml.gz
index 419a52758428ab025066fe79ea1d918df885aec7..8f9a36b0b4bdada78e95408ffd553ce6b8848f1f 100644
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diff --git a/spectroscopy/Perrin/C3H8.xml.gz b/spectroscopy/Perrin/C3H8.xml.gz
index 61e130176f71420435fc4bdca0a6db1d740306a1..646f6e5c4119c37a14a9b17471b5b8d7f7e882ef 100644
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diff --git a/spectroscopy/Perrin/CF4.xml.gz b/spectroscopy/Perrin/CF4.xml.gz
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diff --git a/spectroscopy/Perrin/CH3Br.xml.gz b/spectroscopy/Perrin/CH3Br.xml.gz
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diff --git a/spectroscopy/Perrin/CH3CN.xml.gz b/spectroscopy/Perrin/CH3CN.xml.gz
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diff --git a/spectroscopy/Perrin/CH3Cl.xml.gz b/spectroscopy/Perrin/CH3Cl.xml.gz
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diff --git a/spectroscopy/Perrin/CH3OH.xml.gz b/spectroscopy/Perrin/CH3OH.xml.gz
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diff --git a/spectroscopy/Perrin/CH4.xml.gz b/spectroscopy/Perrin/CH4.xml.gz
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diff --git a/spectroscopy/Perrin/CO.xml.gz b/spectroscopy/Perrin/CO.xml.gz
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diff --git a/spectroscopy/Perrin/COF2.xml.gz b/spectroscopy/Perrin/COF2.xml.gz
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diff --git a/spectroscopy/Perrin/ClO.xml.gz b/spectroscopy/Perrin/ClO.xml.gz
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diff --git a/spectroscopy/Perrin/HNO3.xml.gz b/spectroscopy/Perrin/HNO3.xml.gz
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rename from spectroscopy/Perrin/ARTSCAT-4_Col29_Conventions.txt
rename to spectroscopy/Perrin_artscat34/ARTSCAT-4_Col29_Conventions.txt
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