first order aberration 初级像差 ; 基波
first-order aberration coefficient 初级像差系数
additional first-order chromatic aberration coefficient 附加一级色差系数
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The axial third order aberration coefficients of an inhomogeneous magnetic sector field are derived for the first time.
首次推导出了非均匀扇形磁场的轴向三阶象差系数。
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