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Three-dimensional response surfaces (A, C and E) and two-dimensional contour plots (B, D and F) of palmarumycin C13 yield (mg/L) versus the test variables (mmol/L): Ca2+ and Cu2+ (A and B); Ca2+ and Al3+ (C and D); Cu2+ and Al3+ (E and F). Palmarumycin C13 was abbreviated as C13.
