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diff --git a/post/src/ft2d.h b/post/src/ft2d.h
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+++ b/post/src/ft2d.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.
+*/
+
+#ifndef FT2_H
+#define FT2_H
+
+#include <common.h>
+#include <utilities.h>
+#include <math.h>
+#include <fstream>
+#include <iomanip>
+#include <string.h>
+
+class FFT2D {
+ public:
+
+// input
+  int   periods_input_1, periods_input_2;
+  int   steps_pp_input_1, steps_pp_input_2;
+  int   screen_input_1, screen_input_2;
+
+// internal
+  int   steps_1, steps_2, steps_half_1, steps_half_2, steps_input_1, steps_input_2;
+  float dt_1, dt_input_1, dt_2, dt_input_2;
+  float df_1, df_2;
+  float **local;
+  float *data;
+  float *frequency_1, *frequency_2;
+  float **si;
+  float **co;
+  float **power;
+  int   *nn;
+
+  char errname[filename_size];
+
+      FFT2D            ( int Q_kw, int periods_1, int steps_pp_1, int screen_1,
+			           int periods_2, int steps_pp_2, int screen_2 );
+  int   steps_ft       ( int steps_input );
+  float window         ( float t, int screen_input, int periods_input );
+  void  fftn           ( float* data, int *nn, int ndim, int isign );
+  void  RealFt         ( float** input );
+};
+
+#endif
+