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Table 1

Significance of signal detection.

Template Convolution with the PSF Significance

disk (R = 0.25°) no 4.3σ
point source yes 4.1σ
disk (R = 0.15°) yes 4.6σ
disk (R = 0.25°) yes 4.7σ
disk (R = 0.375°) yes 4.2σ
disk (R = 0.5°) yes 3.5σ
ring (0.45° < R < 0.65°) yes <1σ

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