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  Indian J Med Microbiol
 

Figure 11: Scanning electron microscope images of the internal structure of phantoms with 6% w/v agar and different w/v silicon dioxide concentrations, (a) 0%, (b) 2%, (c) 4%, and (d) 6%

Figure 11: Scanning electron microscope images of the internal structure of phantoms with 6% w/v agar and different w/v silicon dioxide concentrations, (a) 0%, (b) 2%, (c) 4%, and (d) 6%