.arrowsize.., size of arrows

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 ..batch.., flag used for batch mode

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 ..blue..

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 ..debug.., flag used for debugging

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 ..debug.., for debugging (by normal users)

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 ..eof.., flag indicating end-of-file

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 ..exit_status.., exit status from system call

 ... see <a href="Variables.html#Built-inVariables">Built-in Variables</a>.

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 ..fontsize.., size of letters

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 ..graylevel.., graylevel (0=black)

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 ..image_height.., height of image

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