How to put 2 waveforms with different time stamps on a chart

Hi,

I am trying to put 2 waveforms with different timestamps on the same chart.

I am able to do this if I post my data to my chart one time.

When I write to my chart more than one time, the new data overwrites the old data, instead of concatenating to the old data.

See the attached vi for what I am trying to do.

Can anyone suggest how to do this correctly?

Thanks.

- Matt