Board prices come from Kiwi.com and are real totals for your actual passenger mix, not single-adult fares scaled up, so the numbers are directly comparable across destinations. Colour is scaled per matrix — green is the cheapest date pair for that destination and red its dearest — so a green cell on one card can cost more than a red cell on another. Compare destinations by the headline price and the cheapest-first order, not by colour; the yellow ring marks each matrix's own cheapest, and the thick yellow ring plus card border the cheapest anywhere. Click any cell to cross-check it live on Google Flights; verified cells get a solid border and a LIVE tag, or use Fill live to re-price a whole grid (about a minute). Kiwi includes self-transfer combinations, which can be cheap but mean separate tickets. A hatched cell means no price for that date pair, not an expensive one. Switch the board source with FM_BOARD_PROVIDER=travelpayouts (that source gives single-adult estimates, which measured ~30% optimistic for a family).