Fig. 4
Change of FORS2 pixel scale s in chip1 along the X axis for each sky field at Y = 100 px (open circles) and at Y = 500 px (crosses). The average scales (solid curves), the scale obtained by Lazorenko et al. (2014a, horizontal dashed line),and the scale s computed with use of distortion coefficients in chip 2 at Y = 0 (dotted curve) are shown.
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