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XY graph Set X axis to display last 300 seconds

Hello,I am running Windows XP and LabVIEW 8.5. I am writtin a program to take in data from an analyzer. I want the data to dispaly on two different XY graphs. The first graph will show the entire session (about 5 hours of data). However, I want the second graph to show the latest 300 seconds of data collected. Is there a property node I can use to achieve this? I don't want to set up a second array. Thank you for any help or support you can provide. 

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If the points are spaced equally in time (are they?), just use a chart.

 

(You can calculate the requred chart history size from the sampling rate and the desired duration.)

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