Instead of using Read Characters use the Read from Spreadsheet File VI. Wire a comma in as the delimiter and it will give you the data as a 2D numeric array. Make sure you remove the first line.
You can wire the data directly into an XY graph indicator, but to make it work, run the array into a for loop, place Array to Cluster in the loop. Right click it and select 2 as the cluster size. Wire this out of the loop and into the XY graph. You can also see an example of an XY graph If you search for "graph" in the example finder.
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