Fig. 2From: Optimization and in vitro antiproliferation of Curcuma wenyujin’s active extracts by ultrasonication and response surface methodologyThree-dimensional response surface plots showing the effects of experimental factors and their mutual functions on extraction of: a–c Curdione; d–f Furanodienone; g–i Curcumol and j–l Germacrone from Curcuma wenyujin. The unmarked factor in each plot is held at its central valueBack to article page