Assertion: secondary astigmatism | /r/HasProperty | balanced with the lower-order form
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Source sentences:
text: The error is minimized with adding the primary astigmatism with the peak coefficient smaller by 25%, with W as =A( ρ 4 -0.75 ρ 2 ) cos 2 θ , implying that the P-V error of of secondary astigmatism balanced with the lower-order form is smaller by a factor of 0.25 (fourfold) than at either sagittal or tangential focus.