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Three-dimensional surfaces and contours showing the influence of DGG and HPMC. (a) 3D surface plot of DGG and HPMC on solution viscosity; (b) contour of DGG and HPMC on solution viscosity; (c) 3D surface plot of DGG and HPMC on gel viscosity; (d) contour of DGG and HPMC on gel viscosity; (e) target value ranges of solution viscosity and gel viscosity; (f) graphical optimization highlighting an area of operability.
