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Contour plot showing effect of a HPMC (Hydroxypropyl methylcellulose) (X 1) and DLM (X 2); b HPMC (Hydroxypropyl methylcellulose) (X 1) and PG (X 3); c DLM (d-limonene) (X 2) and PG (propylene glycol) (X 3) on response Y 1 (Q 24); corresponding response surface plots (d–f)
