Fig. 1.
Mean PSF-corrected half-light radius vs. magnitude for galaxies measured in the UDF F775W image. Blue dots correspond to galaxies brighter than the VIS limit, and red dots to fainter galaxies within 3″ of a bright one. Dots and error bars correspond to the mean and dispersion over all galaxies in the selected magnitude bin. The dashed blue line shows the linear fit to the bright galaxies, highlighting the need for observational data to measure faint galaxy sizes.
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