Reading the numbers
Ace-ten suited can be dealt 4 ways and a pair of tens 6 ways. Once both hands are out, the cards they share leave 12 possible pairings. Each row above stands for every pairing with the same suit pattern. The best case for ATs is 34.8%, the worst 34.8%: a shared suit takes away flush cards, and a suit held by both hands can split a flush.
Equity counts half of each tie, so it is the share of the pot ATs takes on average if the money goes in now. Compare it with the from the pot odds calculator. For a whole range on each side, use the range equity calculator.