Table 2.
Mean focus offset and standard deviation (SD) across star subsamples in F606W and F814W filters.
| Nstars |  [μm] |
|||
|---|---|---|---|---|
| F606W chip 1 | F606W chip 2 | F814W chip 1 | F814W chip 2 | |
| 5 | 0.06 ± 1.80 | −0.15 ± 2.92 | 0.01 ± 0.45 | 0.22 ± 0.93 |
| 10 | 0.23 ± 1.58 | −0.05 ± 2.59 | −0.007 ± 0.380 | 0.11 ± 0.76 |
| 20 | 0.23 ± 1.48 | 0.02 ± 2.24 | −0.03 ± 0.35 | 0.06 ± 0.63 |
| 40 | 0.17 ± 1.24 | 0.15 ± 2.08 | −0.03 ± 0.28 | 0.01 ± 0.53 |
| 70 | 0.11 ± 1.10 | 0.17 ± 1.73 | −0.01 ± 0.22 | −0.004 ± 0.437 |
| 90 | 0.12 ± 1.02 | 0.12 ± 1.64 | −0.007 ± 0.162 | −0.01 ± 0.32 |
Notes. The mean focus offset is calculated as the difference between the mean focus value obtained using a subsample of Nstars (first column) and the focus value from the full sample of stars in the star fields. The SD of the difference is also provided, for the filters F606W and F814W, across both chips 1 and 2 (columns 2–5).
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