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diff --git a/Utilib/src/thcond.h b/Utilib/src/thcond.h
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+/*
+ freesteam - IAPWS-IF97 steam tables library
+ Copyright (C) 2004-2009  John Pye
+ 
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 2
+ of the License, or (at your option) any later version.
+ 
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifndef FREESTEAM_THCOND_H
+#define FREESTEAM_THCOND_H
+
+#include "common.h"
+
+/* Conductivity [W/m.K] */
+/**
+	Returns the thermal conductivity of water/steam.
+	@see http://www.iapws.org/relguide/thcond.pdf
+
+	Range of validity is entire regions 1,2,3. The correlation is not
+	really applicable in region 4, but will give 'sane' results there.
+
+	@return Thermal conductivity [W/m.K]
+*/
+FREESTEAM_DLL double freesteam_k_rhoT(double rho, double T);
+
+#endif
+