Table 3: Comparison of various astrometric studies involving CdC plate material.

Reference		 Machine Precision Accuracy $N_{\rm pl}$

This paper

 Scanner $0\hbox{$.\!\!^{\prime\prime}$ }18$ $0\hbox{$.\!\!^{\prime\prime}$ }20$ 400
Rappaport 2006 APM $0\hbox{$.\!\!^{\prime\prime}$ }15$ $0\hbox{$.\!\!^{\prime\prime}$ }20$ 512
Ortiz-Gil 1998 PDS $0\hbox{$.\!\!^{\prime\prime}$ }15$ $0\hbox{$.\!\!^{\prime\prime}$ }15$ 1
Geffert 1996 MAMA $0\hbox{$.\!\!^{\prime\prime}$ }15$ $0\hbox{$.\!\!^{\prime\prime}$ }20$ 2


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