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A Variable Sampling Interval Synthetic Xbar Chart for the Process Mean

Fig 4

The VSI synthetic chart for the flow width measurements.

This chart is used to monitor the flow width measurements (in micrometres, μm) for the hard-bake process. The chart signals an out-of-control at the 15th sample which corresponds to the 17th hour from the start of the process.

Fig 4

doi: https://doi.org/10.1371/journal.pone.0126331.g004