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 Purpose: Prints gwp center positions and momenta. 
          Also computes the energy and transmission spectrum.
 Usage  : gwptransmission[-f -i -inter -ver -o -n -p -x -w -h -? -e -l -numeric]

Options : 
 -f FILE : the data is read from file FILE
           rather than from ./auto
           The string FILE may be a relative or full path-name.
 -i DIR : data is stored in directory DIR
 -inter : enables interactive plotting
 -numeric : enables numeric Energy integrals
 -ver    : Version information about the program 
 -o FILE : The difference is written to file FILE.pl rather than to ./XXX
           The string FILE may be a relative or a full path-name.
           If FILE=no, i.e. "-o no", no XXX-file will be opened.
 -n I : Compute the property only every I-th output.
 -p I : Compute I points in position space.
           If I<0, only plot the reduced densities with |I| points each.
 -x R1[,R1..] [unit]R2[,R2..] [unit] [R3[,R3..] [unit]]:
           Specify position space limits for the plot.
           If the set R3 is given, ignore the value of the -p parameter and use R3 as a step size.
 -l limit : limit after which GWP is considered to be transmitted.
 -e R1 [unit] R2 [unit] [R3 [unit]]:
           Compute energy distribution from R1 to R2 with R3 equidistant steps.
 -w      : An existing property file is overwritten.
 -h      : Print this help text. 
 -?      : Print this help text. 
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