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A Dolomite account holds one balance per market: above zero it supplies, below zero it owes, and every market counts against the account's one margin line. So each bar adds every market in USD. The collateral bar adds up to what the account holds: deposited and the interest earned, less what was withdrawn. The debt bar adds up to what it owes: borrowed and the interest accrued, less what was repaid. The bars cover this account number only; the wallet's other Dolomite accounts keep their collateral and debt apart.
Interest is the dashed part. Every row states its market's balance just before and after it: the par the core stores × the market's supply or borrow index at that block. The par moves only when the account acts, so the interest between two rows on a market is the balance just before the later one less the balance after the earlier one, to the base unit. Between events each balance grows with its market's index, in a straight line from one of the account's rows on the market to the next; after the last row, to today's balances from the live read. That growth and the change in prices since each flow are the last line of each bar, Market move and interest since the last event.