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Purpose  : plots potential and/or potential fit interactively
Usage    : showpot [-i -d -D -v -n -u -vfit -vpot -diff -abs
                      -evec -b -contr -ig -ver -h -?]

Options  :
 -i NAME : The files are stored in the directory NAME
 -d FILE : The dvr is read from file FILE/dvr
           rather than from ./dvr or NAME/dvr
 -D DIR  : The output is written to directory DIR. This is useful,
           if one has no right to write to the name directory.
           The directory DIR must exist.
           The string DIR may be a relative or a full path-name.
 -v FILE : The potential is read from file FILE
           If FILE is not given, FILE=vpot is assumed.
           If FILE=no, i.e -v no, vpot file is not read.
 -n FILE : The potential fit is read from file FILE
           If FILE is not given, FILE=natpot is assumed.
           If FILE=no, i.e -n no, npot file is not read.
 -u UNIT : The energy unit UNIT is applied.
 -evec M : The eigenvectors (natural potentials)
           of mode M are written to ASCII file evec.
           M must not equal modc (contracted mode).
           If M=99 then natpots of all modes (except modc) are written.
 -b      : Eigenvectors (natural potentials) are additionally
           written to binary file evecb, (if -evec is set).
 -contr  : The contracted natural potentials of the
           contracted mode is written to file contr.
           WARNING: This may be a lot of data.
 -vfit   : Set plottask to vfit.
 -vpot   : Set plottask to vpot.
 -diff   : Set plottask to vfit-vpot.
 -abs    : Set plottask to abs(vfit-vpot).
 -ig     : ignore certain errors.
 -ver    : Version information about the program 
 -h      : Print this help text. 
 -?      : Print this help text. 
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