To be clear, the final solution is: 
while($logfile = shift) {
    push @data_sets, [{"type" => "file"}, $logfile];
}

gnuplot({"title" => "foo"},
        @data_sets);

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In reply to Re: Re: Stumped by Chart::Graph::Gnuplot parameters by qi
in thread Stumped by Chart::Graph::Gnuplot parameters by qi

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