Figure 1

Response surface and counter plots showing the interaction effect of A and B (a), A and D (b), A and E (c), B and D (d), B and E (e), D and E (f), and E and C (g) on the extraction yield of CUI.
Response surface and counter plots showing the interaction effect of A and B (a), A and D (b), A and E (c), B and D (d), B and E (e), D and E (f), and E and C (g) on the extraction yield of CUI.