This is the official manual for the latest Org-mode release.

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14.8.2.28 :prologue

The prologue header argument is for appending to the top of the code block for execution. For example, a clear or reset code at the start of new execution of a ‘src’ code block. A reset for ‘gnuplot’: :prologue "reset". See also epilogue.

     (add-to-list 'org-babel-default-header-args:gnuplot
                  '((:prologue . "reset")))