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Fig. 2

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Fraction of transmitted flux as a function of FWHM-to-slitwidth ratio for a Gaussian point source that is displaced perpendicular to the slit by a fractional amount of the slitwidth, Δx = (xx0) /w. The inset panel shows the flux loss relative to the case where the object is perfectly centred within the slit. A slit length l = 10 w is assumed.

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