Lines you do not continue

[Lines you do not continue]

Please check out this sample code given below:

<chart showValues='0' connectNullData='1'>
      <set label='Jan' value='420' />
      <set label='Feb' value='295' />
      <set label='Mar' value='523' />
      <set label='Apr' value='473' />
      <set label='May' />
      <set label='Jun' />
      <set label='Jul' value='354' />
      <set label='Aug' value='457' />
      <set label='Sep' value='127' />
      <set label='Oct' value='354' />
      <set label='Nov' value='485' />
      <set label='Dec' value='486' />
  </chart>

Hope it may help you.