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diff --git a/fresnel/common.h b/fresnel/common.h
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+/*
+   This file is part of LPIC++, a particle-in-cell code for
+   simulating the interaction of laser light with plasma.
+
+   Copyright (C) 1994-1997 Roland Lichters
+
+   LPIC++ 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.
+*/
+
+///////////////////////////////////////////////////////////
+//
+// physical constants in SI units
+// mathematical constants
+// common procedures
+//
+///////////////////////////////////////////////////////////
+
+#ifndef COMMON_H
+#define COMMON_H
+
+#define C    2.9979246e+8    // m/s    velocity of light in vacuum
+#define E    1.6021773e-19   // C      electron charge
+#define M    9.1093897e-31   // kg     electron mass
+#define EPS  8.8541878e-12   // C/Vm   dielectric permability
+#define EV   1.6021773e-19   // J      electron volt
+#define HB   1.0545727e-34   // Js     Planck's h/2pi
+#define AB   5.2917726e-11   // m      Bor radius
+#define EN   4.3597483e-18   // J      atomic energy unit = 2 * 13.6 eV
+#define TI   2.4188843e-17   // s      atomic time unit = HB / EN
+
+#define PI   M_PI
+#define TINY 1e-10
+
+//----------------------------------------------------------------------------------------
+
+inline double sqr(double x) { return (x*x); };
+
+static const int filename_size = 100;
+
+#endif
+
+
+
+
+