Proposal Identification No.: A2754 Arecibo Observatory Date Received: 2014-Aug-29 12:59:09 William E. Gordon Telescope Observing Time Request COVER SHEET Section I - General Information Submitted for Sep 1 2014. This proposal has been submitted before. ... For these observations night-time is required. Begin ­ End Interval­Interval ­ ­ ­ ­ Days Needed at This Interval Time Constraints (Must Be Justified in the Prop osal Text) For these observations, nighttime is required. ...

... 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. ...