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I see this little number in my TAC. enter image description here

What is that "42" inside a box right below v208-458? I looked through charts guide to see if I can find that symbol but I couldn't find anything (pretty sure I missed it). Does it have something to do with victor airway or is it separate?

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Per the Chart Users Guide (which covers sectionals and TACs), that is the total mileage between navaids.

enter image description here

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