制程标准值与规格下限之间的差距值。
Distance between the process mean and the lower specification limit scaled using the process standard deviation.
很多时候只有一个规格，它可以是在上限或下限。
Many times there is only one specification and it may be either the upper or lower.
很多时候只有一个规格，它可以是在上限或下限。
Many times there is only one specification and it may be either the upper or lower.
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