From: An augmented Lagrangian method for the Signorini boundary value problem with BEM
N = 40
N = 80
N = 160
N = 320
N = 640
ρ = 100
22
25
24
ρ = 101
11
12
13
ρ = 102
8
9
ρ = 103
7
10
ρ = 104
6
ρ = 105