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== History ==
The range-bar method was first introduced by [[Mary Eleanor Spear]] in her book "Charting Statistics" in 1952<ref>{{Cite book|title=Charting Statistics|last=Spear|first=Mary Eleanor|publisher=McGraw Hill|year=1952|pages=166}}</ref> and again in her book "Practical Charting Techniques" in 1969.<ref>{{Cite book|title=Practical charting techniques|last=
==Elements==
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