Added a readme.

git-svn-id: https://radiativetransfer.org/svn/rt/arts-xml-data/trunk@9367 aaf1aab0-4228-0410-ad68-8dceda47f409

ChangeLog

+2015-07-02  Richard Larsson  <ric.larsson@gmail.com>
+
+	* ARTS-XML-DATA-2-3-14
+	
+	* spectroscopy/PartitionSums/README:  Added.
+
 2015-06-25  Richard Larsson  <ric.larsson@gmail.com>
 
 	* ARTS-XML-DATA-2-3-13

spectroscopy/PartitionSums/README

+This folder contains xml output of partition functions for ARTS
+
+To use this file in ARTS, please specify partition_functions as
+ReadXML(partition_functions,"tips.xml")
+
+The data in tips.xml is from the TIPS program [1] and from ARTS
+built-in partition functions.  The TIPS program grids data between
+70 and 3000 K on a 1 K grid.  The ARTS built-in data is assumed to be
+limited between 150 to 300 K.
+
+The following species are in ARTS built-in but not available in TIPS:
+H2O-262, SO2-636, SO2-628, NH3-4112, HNO3-156, HF-29, HCl-25, HCl-27, 
+HBr-29, HBr-21, HI-27, H2CO-1126, H2CO-1136, H2CO-1128, H2CO-1226, 
+H2CO-2226, N2-45, HCN-224, COF2-369, H2S-122, HCOOH-1261, HCOOH-1361, 
+HCOOH-2261, HCOOH-1262, OClO-656, OClO-676, BrO-96, BrO-16, H2SO4-126, 
+Cl2O2-565, Cl2O2-765, CH3CN-211124, CH3CN-311124, CH3CN-211134, CH3CN-211125, 
+CH3CN-211224, HC3N-12224, HC3N-12234, HC3N-12324, HC3N-13224, HC3N-12225, 
+HC3N-22224, HNC-142, HNC-143, HNC-152, HNC-242, C3H8-21, H-1, He-4, Ar-8, 
+C4H2-2211, SO3-26
+
+The following species are in TIPS but are not yet available to ARTS:
+O3-886, O3-868, O3-678, O3-768, O3-786, O3-776, O3-767, O3-888, O3-887, 
+O3-878, O3-778, O3-787, O3-777, H2CO-126, H2CO-136, H2CO-128, HCOOH-126, 
+CH3CN-2124, CH3CN-2134, CH3CN-3124, CH3CN-3134, C4H2-1221, HC3N_12224, 
+HC3N_12234, HC3N_12324, HC3N_13224, HC3N_12225, HC3N_22224, C2N2-4224, 
+C2N2-5225, C3H4-1221, CH3-2111, CS2-222, CS2-224, CS2-223, CS2-232
+
+[1]
+Fischer, J., R. R. Gamache, A. Goldman, L. S. Rothman, and A. Perrin (2003), 
+Total internal partition sums for molecular species in the 2000 edition of the HITRAN database,
+J. Quant. Spectrosc. Radiat. Transfer, 82(1–4), 401–412, doi:10.1016/S0022-4073(03)00166-3.
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