250, it's your table borders.
Either you'll need to use BORDER=0 in your tables or account for it in the width statements. What's happening is that you have BORDER=2 on your table adding in on each side of the columns (an additional 10 pixels) that's throwing off your table. So you'll either need to scale the total width of the table to 710 to account for this, or turn borders off. That's all.
Cheers,
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