diff --git a/ChangeLog b/ChangeLog
index ac7f1f8b0bbff455eea1a0a2674c179636d81ba0..fc9634bf01bf04d1b028e61800cbf1b9cb1bdd9e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2023-09-21  Oliver Lemke  <oliver.lemke@uni-hamburg.de>
+
+	* ARTS-XML-DATA-2-5-17
+
+	* spectroscopy/cia/hitran2011:
+
+	Removed. Updated version available in arts-cat-data.
+
 2023-09-19  Oliver Lemke  <oliver.lemke@uni-hamburg.de>
 
 	* ARTS-XML-DATA-2-5-16
diff --git a/spectroscopy/cia/hitran2011/README_hitran_cia2012_adapted.txt b/spectroscopy/cia/hitran2011/README_hitran_cia2012_adapted.txt
deleted file mode 100644
index 05caea2fd06285fe469066c2320473d8313da198..0000000000000000000000000000000000000000
--- a/spectroscopy/cia/hitran2011/README_hitran_cia2012_adapted.txt
+++ /dev/null
@@ -1,58 +0,0 @@
-File "hitran_cia2012_adapted.xml.gz" contains HITRAN 2011 CIA data
-adapted for ARTS calculations.
-
-Besides the conversion to ARTS XML format, some changes have
-been made. See below for list of changes and comments.
-
-"N2-CIA-N2-0":   Rototranslational band.
-"N2-CIA-N2-1":   Fundamental band. For this, two different HITRAN datasets have been fused.
-"N2-CIA-H2-0":   
-"N2-CIA-CH4-0":   
-"H2-CIA-H2-0":   
-"H2-CIA-He-0":   
-"H2-CIA-CH4-0":   
-"H2-CIA-H-0":    Only for high temperatures (above 1000 K)
-"He-CIA-H-0":    Only for high temperatures (above 1500 K)
-"O2-CIA-O2-0":   Higher dataset numbers not included (they are in the UV/Vis).
-("O2-CIA-N2-0":  Not included! Only UV/Vis.)
-("O2-CIA-CO2-0": Not included! Only UV/Vis.)
-"CO2-CIA-CO2-0": Only up to 250 cm^-1. HITRAN themselves recommend caution.
-"CH4-CIA-CH4-0":   
-"CH4-CIA-Ar-0":
-
-Valid frequency and temperature ranges are as follows:
-
-- Print
-  CIA tag; Spectral range [cm-1]; Temp range [K]; # of sets
-  N2-CIA-N2-0; 0.02 - 554.00; 40.00 - 400.00; 10
-  N2-CIA-N2-1; 1850.00 - 3000.09; 228.20 - 362.50; 10
-  N2-CIA-H2-0; 0.02 - 1886.00; 40.00 - 400.00; 10
-  N2-CIA-CH4-0; 0.02 - 1379.00; 40.00 - 400.00; 10
-  H2-CIA-H2-0; 20.00 - 10000.00; 200.00 - 3000.00; 113
-  H2-CIA-He-0; 20.00 - 20000.00; 200.00 - 9900.00; 334
-  H2-CIA-CH4-0; 0.02 - 1946.00; 40.00 - 400.00; 10
-  H2-CIA-H-0; 100.00 - 10000.00; 1000.00 - 2500.00; 4
-  He-CIA-H-0; 50.00 - 11000.00; 1500.00 - 10000.00; 10
-  O2-CIA-O2-0; 1150.00 - 1950.00; 193.40 - 353.40; 15
-  CO2-CIA-CO2-0; 1.00 - 250.00; 200.00 - 800.00; 7
-  CH4-CIA-CH4-0; 0.02 - 990.00; 40.00 - 400.00; 10
-  CH4-CIA-Ar-0; 1.00 - 697.00; 70.00 - 296.00; 5
-
-
-Log of Changes:
-
-N2-N2: Merged the two high-frequency datasets.
-
-O2-O2: Kick out UV/Vis datasets
-
-CO2-CO2: This is only the self continuum of CO2. The CO2-air continuum
-	 has strong features above 250 cm^-1 that
-	 are present in CKD_MT but missing here.
-	 HITRAN data generally looks weird. It is only in the
-	 alternative folder, and in the paper they basically recommend
-	 not to use it. ==> No changes, but usage not recommended.
-
-O2-N2, O2-CO2: UV/Vis only, remove.
-
-Author: Stefan Buehler
-Date:   2013-02-13
diff --git a/spectroscopy/cia/hitran2011/hitran_cia2012_adapted.xml.gz b/spectroscopy/cia/hitran2011/hitran_cia2012_adapted.xml.gz
deleted file mode 100644
index 4ec52a5a2b70263b03cf3a6ae36d98b36abd8f04..0000000000000000000000000000000000000000
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