找出垂直校准的图案，并从下面列表中选择那个校准图案的号码。

Find the pattern that is vertically aligned, and select the number of that alignment pattern from the list below.

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之所以有此需要，是因为所加载荷通常是垂直于校准装置平面的。

This is necessary because the loads are usually applied normal to the calibration fixture surface.

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或者，校准可以通过使用一个偏振标准品来进行，该标准品由一片装在垂直于右侧通道的架子上的石英构成。

Alternatively, calibration may be checked using a Polarization Reference Standard, which consists of a plate of quartz mounted in a holder perpendicular to the light path.

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