Bar Chart plotting issue with two data set

I'm trying to plot a bar chart with two data set points say 335,285, so by looking at values 1st bar should be longer than 2nd value but while plotting bar chart it always takes 335 as max value and plots two points on same level of 335. I have also tried plotting with data set array(200,50,100), with this, 1st and last points are at 200 which shouldn't. Below is my code,

$chart = array(
'#chart_id' => 'test_chart',
'#title' => chart_title(t('Bar Chart'), 'cc0000', 15),
'#type' => CHART_TYPE_BAR_V_GROUPED,
'#size' => chart_size(400, 200),
'#grid_lines' => chart_grid_lines(30, 15),
'#chart_fill' => chart_fill('bg', 'ffffff'),
'#bar_size' => chart_bar_size(15, 5),
);

$chart['#data'][] = array(200,50,100);

$chart['#data_colors'][] = '3598D9';

$vars['line_chart'] = theme('chart', array('chart' => $chart));
echo $vars['line_chart'];