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I've contemplated this chart a few times before and wondered at its intent and implications.
In reading the chart, the new common core levels are much broader through 3rd grade, after that they are higher than the lexile levels previously ascribed to each grade.

Because this is not a common core link, but rather a lexile link, it is possible that the intent and purpose of this chart is an attempt by lexile to try to remain relevant (and aligned) in the new era of common core?