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0.768 retrace of the GDAX low (890) to the high (19617).
Edit: I just reworked it and now I see what you mean

The measurement must be taken from the lowest low of the previous bear market on the 15th of Jan. 2015 to the all time high on the 17th of Dec. 2017 ($162.68 and $19704.18 respectively in my data feed).