| 摘要 |
A method for measuring the height variability of a stack of materials comprises placing a stack of materials onto a holder that comprises a base and at least two sides extending from the base such that the stack of materials rests on the base and is generally flush with the sides. A distance of a top of the stack of materials relative to a fixed plane is measured at various locations along the top of the stack of materials. The height variability of the stack is determined based on the measurements.
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