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. 2013 Aug 18;4(4):345–356. doi: 10.1007/s13205-013-0160-2

Fig. 3.

Fig. 3

Response surface curves (3D/contour plots) showing interactions between a peptone and yeast extract; b wheat bran and yeast extract; c KNO3 and wheat bran; d peptone and wheat bran and e KNO3 and yeast extract and f is the perturbation plot showing simultaneous interaction of all the four factors on xylanase activity