 }).get([0, 2*Math.PI], Math.PI/25)
            });

            $('#test-4 button').click(function(e) {
                var index = parseInt($(e.target).attr('data-index'));
                chart.option('width', sizes[index][0]);
                chart.option('height', sizes[index][1]);
            });
        });
        </script>

        <!-- Test 5 -->
        <div id="test-5" class="test">
            <h2>6. Option: domain</h2>
            <div class="epoch"></div>
            <p>
                <butt