Table 1: RMS after each step in the scanner-distortion correction.
Step rms x ($\mu\rm m$) rms y ($\mu\rm m$)
Initial (uncorrected) 31.2 32.9
1-d function corrected 18.2 23.0
Correction cubic pattern 4.61 4.42
2nd iteration cubic pattern 4.52 4.31


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