Futures spreads on 2W to OKC index (6-exchange arithmetic mean)

Shows spread on OKC futures 2W contract to the Index (manually computed here as: (BITSTAMP:BTCUSD+BITFINEX:BTCUSD+OKCOIN:BTCUSD+HUOBI:BTCCNY*CNYUSD+BTCCHINA:BTCCNY*CNYUSD+OKCOIN:BTCCNY*CNYUSD)/6