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my (@h,@c);
push @h, $_->{hour} foreach(@{$data});   # no so great
...
my $new = [ \@h, \@c ];

$gd = $graph->plot($new);                # wrong - see orbital's comme
+nt

BEFORE:                          AFTER:
$VAR1 = [                        $VAR1 = [
...
            'hour' => 2                  ];
          }
        ];