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Fig. 3


Distribution of VIPERS targets on the sky is plotted for the two fields W1 and W4. The points are coloured according to the target sampling rate (TSR) which is defined as the ratio of the number of targeted galaxies in a patch of sky over the total number available in the parent photometric catalogue. In this work we estimate the TSR within a circular aperture with radius 3 arcmin. The TSR depends on the projected density of targets on the sky. TSR is higher in low-density fields with few potential targets while in high-density fields slit positioning constraints severely limit the number of sources that may be targeted. The inset histogram shows the cumulative fraction of targets with TSR below a given value. The median TSR over the survey is 48%.

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