Fig. 4
Dependence of the reduced 
on the epoch average seeing a) for brightest field stars near DE0716−06 in the initial data with corrected chip instability (Sect. 4.3.2); b) same for stars about 1 mag fainter; c) after correction for space-correlated errors (Sect. 4.3.4); d) with all corrections of Sect. 4.3.4 and Sect. 4.3.5. Standard computations with a reduction parameter k = 10.
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