Table 1: King function PSF coefficients determined from piled-up sources used in the centroiding simulations.
Target/Obsid Count ratea $r_{\rm c}^b$ $\beta$ c
3c273/00050900011 2.31 11.88 1.63
GK Per/00030842017 1.30 8.85 1.49
GK Per/00030842013 0.84 7.21 1.46
a Observed PC mode grade 0-12 count rate in a 30 pixel extraction circle.
b Core radius (arcsec).
c Index.

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