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When graphing alignment, plotting "mils of misalignment" along the Y-axis is correct because it quantifies the degree of misalignment between machine components. Mils, which are a unit of measurement equal to one-thousandth of an inch, provide a fine scale to demonstrate even the smallest alignment discrepancies. This measurement is crucial for maintenance professionals as it allows them to assess the level of misalignment accurately and make the necessary adjustments to ensure optimal machine performance and longevity.

Using distance in inches would provide a more general measurement without the specificity necessary for alignment tasks. Total machine length does not offer relevant information about the alignment condition itself, and machine weight is unrelated to alignment metrics. Hence, plotting mils of misalignment is the most effective way to illustrate alignment data critically for maintenance activities.