259129.fig.003a
(a)
259129.fig.003b
(b)
259129.fig.003c
(c)
259129.fig.003d
(d)
259129.fig.003e
(e)
259129.fig.003f
(f)
259129.fig.003g
(g)
259129.fig.003h
(h)
259129.fig.003i
(i)
Figure 3: Response surface plot for EWR: (a) factor plot, (b) factor plot, (c) factor plot, (d) contour plot between and , ((e) and (f)) interactions plot between and , (g) normal plot of residuals, (h) residuals versus predicted values, and (i) predicted versus actual values.