  Future baryon acoustic oscillation (BAO) surveys will survey very large
volumes, covering wide ranges in redshift. We derive a set of redshift weights
to compress the information 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.
