Catchment area

Surfaces

Form

B5

1.7 ≤ K_G

Very elongated

B4

1.4 ≤ K_G < 1.7

Extended

B3

1.3 ≤ K_G < 1.4

Amoeboid

B2

1.03 ≤ K_G < 1.3

Ovoid

B1

1 ≤ K_G < 1.03

Circular