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SEM micrographs of (a–d) K4M based filament and matrix tablet (a = filament, b = whole matrix tablet, c = side view of matrix tablet and d = surface view showing edges), (e-h) K15M based filament and matrix tablet (e = filament, f = whole matrix tablet, g = side view of matrix tablet and h = surface view showing edges) and (i–l) K100M based filament and matrix tablet (i = filament, j = whole matrix tablet, k = side view of matrix tablet and l = surface view showing edges).
