Fig. 4

Different degrees of biases, due to the inclined incidence of the electron beam and affecting the perception of pore diameters. a Inside of black dotted line reliable measurements, inside of orange dotted line measures may be conjectured, inside of red dotted line measurements should not be used. b Inside of red dotted line images unreliable because of radial divergence. In the orange zone even if the pore is partially infilled, the full length of the diameter can be perceived