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diff --git a/post/src/ft.h b/post/src/ft.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 FT_H
+#define FT_H
+
+#include <common.h>
+#include <utilities.h>
+#include <math.h>
+#include <fstream>
+#include <iomanip>
+#include <string.h>
+
+class FFT {
+ public:
+
+// input
+  int   periods_input;
+  int   steps_pp_input;
+  int   periods_screen;
+  int   padding;
+
+// internal
+  int   steps, steps_half, steps_input;
+  double dt, dt_input;
+  double df;
+  double *local;
+  double *data;
+  double *frequency;
+  double *si;
+  double *co;
+  double *phase;
+  double *power;
+  double *corr;
+
+  char errname[filename_size];
+
+                      FFT( int periods, int steps_pp, int screen );
+  int            steps_ft( void );
+  void                fft( double* data, int nn, int isign );
+  int              RealFt( float* input );
+  double           window( double );
+  int         correlation( float *input, double mid, double width );
+  double frequency_filter( double freq, double mid, double width );
+  void                out( float* input, char *path, char *appendix );
+};
+
+#endif
+