Figure 3

MFM images of all samples in Oven-, Autoclave-, Heater-, and LFE-method (left–right). (a–d) 2D topography images. (e–h) 3D topography images. (i–l) 2D amplitude images. (m–p) 3D amplitude images of FGPs in Oven-, Autoclave-, Heater-, and LFE-method, respectively (left–right).