However, if the plane of the selector aperture is not precisely coplanar with that of the first image, then diffracted rays originating from outside the area defined by the aperture may contribute to the diffraction pattern.

• 然而，如果选择孔的平面与第一次成像不是正好共面，源自孔指定区域外部的衍射线可能影响衍射模型。