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+      REAL FUNCTION slVDV (VA, VB)
+*+
+*     - - - -
+*      V D V
+*     - - - -
+*
+*  Scalar product of two 3-vectors  (single precision)
+*
+*  Given:
+*      VA      real(3)     first vector
+*      VB      real(3)     second vector
+*
+*  The result is the scalar product VA.VB (single precision)
+*
+*  P.T.Wallace   Starlink   November 1984
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*
+*  License:
+*    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 (see SLA_CONDITIONS); if not, write to the
+*    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+*    Boston, MA  02110-1301  USA
+*
+*  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+*-
+
+      IMPLICIT NONE
+
+      REAL VA(3),VB(3)
+
+
+      slVDV=VA(1)*VB(1)+VA(2)*VB(2)+VA(3)*VB(3)
+
+      END