Seven formulas are a practical pilot core, but they are not enough for stable inference unless repeated or augmented.
NIST lists the seven coordinates and warns about the saturated higher-order fit.
For three components, the simplex-centroid consists of three pure samples, three 50:50 binary mixtures, and one equal one-third mixture; without replication or augmentation, a saturated model may leave no degrees of freedom for error.
16
14
Three-component design
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