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Fig. 6

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Results of the island-finding algorithm. Each panel shows the residual image after the PCA galaxy subtraction, with the point score of each component given separately and the total point score at the top (see text). The top row shows systems which have lenses and is ordered so that the highest point-score is on the left and the lowest on the right. Objects with high ellipticity and high curvature, tangential to the radius vector from the centre of the image, are preferred; lens systems without such objects are hard to recognise by eye and also tend to attract a lower point score. The bottom row shows a sample of non-lenses, again ordered by point score. High point-score objects are generally those in which chance coincidences produce configurations that mimic the presence of lensing.

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