--- /dev/null
+c===========================================================================
+c
+c This file is part of TISEAN
+c
+c Copyright (c) 1998-2007 Rainer Hegger, Holger Kantz, Thomas Schreiber
+c
+c TISEAN is free software; you can redistribute it and/or modify
+c it under the terms of the GNU General Public License as published by
+c the Free Software Foundation; either version 2 of the License, or
+c (at your option) any later version.
+c
+c TISEAN is distributed in the hope that it will be useful,
+c but WITHOUT ANY WARRANTY; without even the implied warranty of
+c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+c GNU General Public License for more details.
+c
+c You should have received a copy of the GNU General Public License
+c along with TISEAN; if not, write to the Free Software
+c Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+c
+c===========================================================================
+c Statistics for time reversibility
+c author T. Schreiber (1999)
+c===========================================================================
+ parameter(nx=1000000)
+ dimension x(nx)
+ character*72 file
+ data iverb/1/
+
+ call whatido("time reversal asymmetry statistic",iverb)
+ id=abs(ican("d",1))
+ nmaxx=ican("l",nx)
+ nexcl=ican("x",0)
+ jcol=ican("c",0)
+c isout=igetout(fout,iverb)
+
+ do 10 ifi=1,nstrings()
+ call nthstring(ifi,file)
+ nmax=nmaxx
+ call readfile(nmax,x,nexcl,jcol,file,iverb)
+ t2=0
+ t3=0
+ do 20 n=id+1,nmax
+ t2=t2+(x(n)-x(n-id))**2
+ 20 t3=t3+(x(n)-x(n-id))**3
+ 10 write(*,*) t3/t2, " "//file(1:index(file," ")-1)
+ end
+
+ subroutine usage()
+c usage message
+
+ call whatineed(
+ . "[-d# -l# -x# -c# -V# -h] file(s)")
+ call popt("d","delay (1)")
+ call popt("l","number of values to be read (all)")
+ call popt("x","number of values to be skipped (0)")
+ call popt("c","column to be read (1 or file,#)")
+ call pall()
+ stop
+ end
+