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Standard deviations of errors. σerr for different FOV sizes and CAs. Red: r0 = 20 cm; Green: r0 = 10 cm; Blue: r0 = 7 cm. N × N-pixel subfields. Diamonds (◇): image scale 0″̣41/pixel, varying N =  {16,24,36}  as labeled in the plots; Down triangles (▿): 0″̣29/pixel, N = 24; Up triangles (▵): 0″̣53/pixel, N = 24. Symbols below the dotted line correspond to data without noise, above the line with 1% noise. Note different vertical scales.

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