0 0 m -1 0.333 l -1 -0.333 l h 0 0 m -1 0.333 l -1 -0.333 l h 0.6 0 0 0.6 0 0 e 0.4 0 0 0.4 0 0 e 0.6 0 0 0.6 0 0 e 0.5 0 0 0.5 0 0 e 0.6 0 0 0.6 0 0 e 0.4 0 0 0.4 0 0 e -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.4 -0.4 m 0.4 -0.4 l 0.4 0.4 l -0.4 0.4 l h -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.5 -0.5 m 0.5 -0.5 l 0.5 0.5 l -0.5 0.5 l h -0.6 -0.6 m 0.6 -0.6 l 0.6 0.6 l -0.6 0.6 l h -0.4 -0.4 m 0.4 -0.4 l 0.4 0.4 l -0.4 0.4 l h -0.43 -0.57 m 0.57 0.43 l 0.43 0.57 l -0.57 -0.43 l h -0.43 0.57 m 0.57 -0.43 l 0.43 -0.57 l -0.57 0.43 l h 0 0 m -1 0.333 l -1 -0.333 l h 0 0 m -1 0.333 l -0.8 0 l -1 -0.333 l h 0 0 m -1 0.333 l -0.8 0 l -1 -0.333 l h -1 0.333 m 0 0 l -1 -0.333 l 0 0 m -1 0.333 l -1 -0.333 l h -1 0 m -2 0.333 l -2 -0.333 l h 0 0 m -1 0.333 l -1 -0.333 l h -1 0 m -2 0.333 l -2 -0.333 l h Alpha shape 1 2 3 4 5 6 7 1 2 3 3 2 3 3 4 4 4 4 5 5 5 5 7 7 7 7 7 7 6 7 6 4 0 0 4 320 704 e 322.919 706.788 m 317.189 701.058 l 317.189 701.203 l 317.551 706.934 m 322.629 701.058 l 230 680 m 240 670 l 230 680 m 240 670 l 230 680 m 240 670 l 230 680 m 240 670 l 230 680 m 220 670 l 230 680 m 230 670 l 220 660 m 220 650 l 230 660 m 230 650 l 260 680 m 260 670 l 260 660 m 260 650 l 300 680 m 300 670 l 300 680 m 290 670 l 290 660 m 290 650 l 300 660 m 300 650 l 330 680 m 330 670 l 350 680 m 350 670 l 350 660 m 350 650 l 320 700 m 240 690 l 320 700 m 270 690 l 320 700 m 310 690 l 320 700 m 330 690 l 320 700 m 350 690 l 320 700 m 380 690 l 320 700 m 400 690 l Alpha complex structure 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 58.1341 0 0 58.1341 218.925 692.601 e 60 710 m 40 660 l 40 660 m 130 690 l 130 690 m 60 710 l 40 660 m 80 580 l 80 580 m 130 580 l 130 580 l 130 580 m 110 520 l 110 520 m 50 530 l 50 530 l 50 530 l 50 530 m 80 580 l 80 580 m 110 520 l 110 520 l 130 580 m 130 690 l 108.275 743.531 m 166.45 743.531 l $\alpha$ filtration value $> \alpha$ are greyed 280 660 m 300 680 l 280 660 m 300 640 l 370 660 m 350 680 l 370 660 m 350 640 l 290 670 m 360 670 l 290 650 m 360 650 l equivalent