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Future baryon acoustic oscillation (BAO) surveys will survey very large volumes, cov-ering wide ranges in redshift. We derive a set of redshift weights to compress the in-formation in the redshift direction to a small number of modes. We suggest that such a compression preserves almost all of the signal for most cosmologies, while giving high signal-to-noise measurements for each combination. We present some toy models and simple worked examples. As an intermediate step, we give a precise meaning to the “effective redshift ” of a BAO measurement. Key words: 1
Zhu et al. (Wed,) studied this question.