diff --git a/ChangeLog b/ChangeLog
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+2013-05-21  Richard Larsson  <ric.larsson@gmail.com>
+
+	* ARTS-XML-DATA-2-1-47
+	
+	* spectroscopy/LineMixing: Contains necessary parameters for on-the-fly
+	line-mixing with the functionality recently added to ARTS by me and Oliver.
+
 2013-03-08  Stefan Buehler  <sbuehler(at)ltu.se>
 
 	* ARTS-XML-DATA-2-1-46
diff --git a/spectroscopy/LineMixing/2nd_order/README b/spectroscopy/LineMixing/2nd_order/README
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+The data in here is supposed to be used with the species-tag "LM-2NDORDER".
+Below follows a description of the file(s) in use:
+
+o2_v1_0_band_40-120_GHz
+    Based on: Makarov et al., 2011, 60-GHz oxygen band: Precise experimental 
+    profiles and extended absorption modeling in a wide temperatur range, 
+    JQSRT 112, 1420-1428.
+    Testeds region: 245 K to 334 K. 
+    Can be matched to quantum numbers: v1, Upper N, Lower N, Upper J, Lower J
+    Contains:  First Order Zeroth Phase Correction, 
+               First Order First Phase Correction,
+               Second Order Zeroth Absorption Correction,
+               Second Order First Absorption Correction,
+               Second Order Zeroth Line-Center Correction,
+               Second Order First Line-Center Correction,
+               Standard Temperature For Corrections,
+               First Order Phase Temperature Correction Exponential Term,
+               Second Order Absorption Temperature Correction Exponential Term,
+               Second Order Line-Center Temperature Correction Exponential Term.
diff --git a/spectroscopy/LineMixing/2nd_order/o2_v1_0_band_40-120_GHz.xml.gz b/spectroscopy/LineMixing/2nd_order/o2_v1_0_band_40-120_GHz.xml.gz
new file mode 100644
index 0000000000000000000000000000000000000000..b2cf6061536c469bba03354e412e00bfe3079318
Binary files /dev/null and b/spectroscopy/LineMixing/2nd_order/o2_v1_0_band_40-120_GHz.xml.gz differ