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Z chart

noun
  1. statistics a chart often used in industry and constructed by plotting on it three series: monthly, weekly, or daily data, the moving annual total, and the cumulative total dating from the beginning of the current year
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012