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3.24.76 variables
The variables command lists the current value of user-defined and internal variables. Gnuplot internally defines variables whose names begin with GPVAL_, MOUSE_, FIT_, and TERM_.
Syntax:
|       show variables      # show variables that do not begin with GPVAL_
      show variables all  # show all variables including those beginning GPVAL_
      show variables NAME # show only variables beginning with NAME
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