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We introduce Reference Abstraction (RA), Summary Abstraction (SA), and Abstraction\n  Ratio (AR) -- a set of principled heuristic metrics that measure how much a summary diverges from extractive copying\n  of the source text. The formulation uses the harmonic mean of document lengths modulated by a cubic non-overlap\n  factor, yielding dimensionally consistent, bounded output with non-linear sensitivity to the extractive-abstractive\n  boundary. 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The formulation uses the harmonic mean of document lengths modulated by a cubic non-overlap\n  factor, yielding dimensionally consistent, bounded output with non-linear sensitivity to the extractive-abstractive\n  boundary. 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