Fig. 4

Plot of θmax versus D1max (red circles) and D2max (black circles) for (a) S-net, b ETMC, c non-buried DONET1, and d buried DONET1 stations
Plot of θmax versus D1max (red circles) and D2max (black circles) for (a) S-net, b ETMC, c non-buried DONET1, and d buried DONET1 stations