LL-046 - Gaia
Summary: A parametrisation of the quasi-monochromatic line-spread function (LSF) for GAIA is proposed, using an analytical function describing the diffraction wings plus a 'bi-quartic' spline representation of the core. The quasi-monochromatic point-spread function (PSF) is modelled as the product of the along-scan and across-scan LSFs. Two appendices give details on the numerical PSF calculation and on bi-quartic B-splines.
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