Fig. 7
![Fig. 7](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs42269-020-00301-3/MediaObjects/42269_2020_301_Fig7_HTML.png)
The 3D surface plots representing interaction between factors affecting IY of α-amylase. a PEI percent and PEI activation time. b PEI percent and GA percent. c PEI percent and GA activation time. d PEI activation time and GA percent. e PEI activation time and GA activation time. f GA percent and GA activation time