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Table 1 Harrat Rahat boundary summary statistics. Clark-Evans (R) values are reported alongside the standard variate (c), Hop-F (Ag) values are reported with the standard error on the mean from 1000 simulations

From: Sensitivity to volcanic field boundary

Boundary

Area (km2)

Vent density (km−2)

R (Clark-Evans)

Ag (Hop-F)

Convex hull

12,535

0.077

0.652, c = −20.77

1.014 ± 0.047

Ellipse

22,430

0.043

0.487, c = −30.58

1.006 ± 0.043

Rectangle

14,717

0.066

0.601, c = −23.77

0.978 ± 0.048

Isocontour

13,496

0.072

0.628, c = −22.18

0.914 ± 0.038

Anisocontour

15,292

0.063

0.5899, c = −24.45

0.956 ± 0.047