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Fig. 6

image

Surface brightness upper limits (triangles) for circularly symmetric extended Lyα emission around our 5 quasars as a function of radial angular (bottom abscissa) or physical extent (top abscissa). The integrated observed signal within each apertures is shown by the black points, where the error bars indicates the standard deviation within the aperture, as a measure of the irregularity of the flux distribution within the aperture.

This figure is made of several images, please see below:

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