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Multi-
waveband
astronomy
Galaxy
halos/
ISM
Example: N4666 Halos picture gallery Emission processes Astronomical observatories Telescopes
and instr-
umentation
Observing techniques Radio holo-
graphy
Telescope surface accuracy Radio "seeing" monitor Amateur radio astronomy SIMPLE inter-
ferometer
Astro-
photo-
graphy

The radio halo of NGC 7090

1.43 GHz image obtained with the Australia Telescope Compact Array

2.45 GHz image obtained with the Australia Telescope Compact Array