259129.fig.002a
(a)
259129.fig.002b
(b)
259129.fig.002c
(c)
259129.fig.002d
(d)
259129.fig.002e
(e)
259129.fig.002f
(f)
259129.fig.002g
(g)
259129.fig.002h
(h)
259129.fig.002i
(i)
259129.fig.002j
(j)
259129.fig.002k
(k)
259129.fig.002l
(l)
Figure 2: Response surface plot for MRR: (a) factor plot, (b) factor plot, (c) factor plot, (d) contour plot between and , ((e) and (f)) interactions plot between and , (g) contour plot between and , ((h) and (i)) interactions plot between and , (j) normal plot of residuals, (k) residuals versus predicted values, and (l) predicted versus actual values.