Fig. 4

Sample image of K3QW-557 (a, b ultra-depth-of-field microscopic image; c BSE image of the area of Fig. 4b; and d partially enlarged BSE image in Fig. 4c).
Sample image of K3QW-557 (a, b ultra-depth-of-field microscopic image; c BSE image of the area of Fig. 4b; and d partially enlarged BSE image in Fig. 4c).