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#### 14.8.2.26 `:prologue`

The 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")))