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The Rapid ASKAP Continuum Survey (RACS) is the first large-area survey to be conducted with the full 36-antenna Australian Square Kilometre Array Pathfinder (ASKAP) telescope. RACS will provide a shallow model of the ASKAP sky that will aid the calibration of future deep ASKAP surveys. RACS will cover the whole sky visible from the ASKAP site in Western Australia and will cover the full ASKAP band of 700–1800 MHz. The RACS images are generally deeper than the existing NRAO VLA Sky Survey and Sydney University Molonglo Sky Survey radio surveys and have better spatial resolution. All RACS survey products will be public, including radio images (with
15 arcsec resolution) and catalogues of about three million source components with spectral index and polarisation information. In this paper, we present a description of the RACS survey and the first data release of 903 images covering the sky south of declination
made over a 288-MHz band centred at 887.5 MHz.
The stone circles of northeast Scotland (Figure 1) take a most distinctive form. On one level, they are made up of structural elements that are widely distributed in Britain: they are built from raw materials that had been selected for their colour and texture; the monoliths are graded in height towards the southwest and may have been aligned on the moon (Burl 2000). On another level, they have a character all of their own. They are known as ‘recumbent’ stone circles because their most massive component is a large flat block which is bracketed by two tall pillars or ‘flankers’ (Burl 2000: 215–33).
A 54 year old woman presenting to the psychiatric services with persecutory delusions, complex visual hallucinations and fluctuating levels of consciousness was discovered to have a meningioma occupying the cerebellopontine angle. The psychiatric symptomatology of cerebellopontine angle lesions is reviewed and the pathogenic mechanisms are explored in the light of the symptomatology observed.