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The unit is a procurement decision. Grey: fewer than 10 decisions — “low data”. Red: the top supplier holds 30% of decisions or more. Green: the top supplier holds less than 20%, there are at least 5 different suppliers and (where at least 5 contract + estimate pairs exist) the median contract/estimate is at most 95%, i.e. the price is cut by 5% or more. Yellow: everything else. The colour describes how wins are spread, not the quality of the authority.