Fig. 4From: Managing coppice forests for rockfall protection: lessons from modelingComparison of indicators derived from our model simulations (protective effect PE d and run-out distance d 99.5) with an indicator calculated from stem density and basal area (MTFD) for 0.5 m3 rocks. Age grouping is based on a cluster analysis (see Section 3.3) and the symbols are explained in Fig. 5. Note that the x-axis is drawn using a logarithmic scaleBack to article page