Example of recovery test for the faintest blob (Blob 2) in our final sample. We show the distribution of the recovered isophotal area for two NDWFS subfields for illustrative purposes. This blob is actually located in the NDWFS J1431+3531 subfield (right) and has the worst recovery fraction (f_recv) in the NDWFS J1428+3531 subfield (left). The bins with zero size indicate nondetections. The vertical dashed line represents our selection criteria for blob size (25 '').