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:prologueThe value of the prologue header argument will be
prepended to the code block body before execution. For example,
:prologue "reset" may be used to reset a gnuplot
session before execution of a particular code block, or the
following configuration may be used to do this for all gnuplot
code blocks. Also see epilogue.
(add-to-list 'org-babel-default-header-args:gnuplot
'((:prologue . "reset")))