... However, because ALFA was built to enable very large-scale sky surveys, NAIC seeks to encourage the formation of research teams, consortia, to take on the task of conducting ambitious sky surveys with the primary goal of creating legacy archival databases for public use. The legacy sky surveys are done as a partnership between NAIC and the research consortia, the policies and guidelines for which are summarized here. ... NAIC will archive the raw data at the Arecibo Observatory. ...

... 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. ...