Data sets where we detect significant asymmetric signal but rule it to be a false positive through similarity in structure to other data sets taken during the same night. Left: reconstructed Images Middle: computed significance maps. Right: V2 plots. First row: RXJ 1615.3-3255, K-band, Second row: RXJ 1842.9-3532, K-band, Third row: V2062 Oph, K′-band. We rule out these asymmetries because of the similarity in the structure of their artefacts. All three targets were observed on the same night and the same structure is also observed in some of the calibrators. The position angle of the structures differ by the same angle as the on sky rotation of the 9-hole mask (See Sects. 6.5 and 6.7). The cause of this effect is unknown.
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