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A version based on David Waves' description in his book 'Trade About to Happen' of his adaptation of the Wyckoff wave chart. The indicator directionally accumulates volume, adding to each brick or candle close, with color indication for up and down. it can be used it with tick or real volume, it also changes color when the accumulated value of the previous wave is exceeded, being the trade signal. Yellow color is used for doji candlestick, it will continue with accumulation without zero the sum