Rfmonitor data :090101 .5*( maxAllowable exposure ) 0.0 -0.5 -1.0 -1.5 5 10 15 Hour of day Ast 20 Rfmonitor data :090201 .5*( maxAllowable exposure ) 0.40 0.35 0.30 0.25 0.20 0.15 5 10 15 Hour of day Ast 20 Rfmonitor data :090301 .5*( maxAllowable exposure ) 0.30 0.25 0.20 0.15 0.10 5 10 15 Hour of day Ast 20 Rfmonitor data :090501 .5*( ...

... 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. ...