... I have been doing some work on this idea, based on using only the top 4 strips from the strawman proposal (+22, +26, +30, +34) for an area of 2748 sq. deg. This leads to a reduction in volume of approximately 30% at most masses. ... The attached figures show the volume covered by the wide-area ALFALFA and the reduced-area ALFALFA with minimum distances of 15, 10 and 5 Mpc. ... Robert Minchin [ Part 2, "" Application/POSTSCRIPT 16KB. Unable to print this part. ...

... 2.3 Data acquisition Spectra generated by the Multibeam correlator contain the usual structure seen in spectra from other H i instruments: a bandpass spectrum which is the sum of the sky , ground and receiver temperatures multiplied by the product of the filters in the receiver chain; superimposed on this is a noise ... Note also that sources extended much beyond ,40 arcmin can be imaged poorly in HIPASS images because of the bandpass sidelobe effect described in Section 3.3. ...