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Response 3D surface plot for the effect of HPMC E5: MDX ratio (X1) and PG % (X2) on the (a) tensile strength (Y1), (b) percentage elongation (Y2) at break, (c) elastic modulus (Y3), percent DPX dissolved after 5 min (Y4), and in vivo mouth dissolving time of DPX instantly-dissolving buccal films.
