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gnuplot({"title" => "foo"},
       [{"type" => "file"}, "cdb.7600.log"],
       [{"type" => "file"}, "cdb.8299.log"]);

use Chart::Graph qw(gnuplot);

...
gnuplot(\%global_options, [\%data_set_options, \@matrix], 
                          [\%data_set_options, \@x_column, \@y_column]
+,
                          [\%data_set_options, < filename >], ... );

while($logfile = shift) {
    push @data_sets, ({"type" => "file"}, $logfile);
...

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