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Table 5

Error budget (in nm rms).

Asterism A47 A53 A12

IR image hour 0h10m00s 3h26m33s 6h06m41s
Engaged slopes hour 0h10m43s 3h24m44s 6h07m07s
r0 (cm) 16.3 10.0 13.0

on-sky simul on-sky simul on-sky simul
σ Tomo 156 161 219 220 188 201
σ OL 55 0 140 0 116 0
σ TomoNoiseFilt 48 78 56 79 97 156
σ AliasGround 95 95 132 132 83 83
σ AliasAlt 15 15 28 28 22 22
σ BW 115 101 142 162 128 145
σ Fit 138 138 206 206 165 165
σ FieldStat 77 0 106 0 72 0
σ NCPA 115 0 115 0 115 0

σ ErrIR 297 265 419 376 357 347

exp( − (2πσErrIR/λ)2) (%) 22.6 30.6 5.2 9.1 11.7 13.1
IR image SR (%) 20.1 33.3 10.3 16.5 16.4 18.4

Ratio 1.12 0.92 0.50 0.55 0.71 0.71

Notes. Comparison with simulations. Ratio = IR image SR / exp(− (2πσErrIR/λ)2).

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