Produce a Gantt plot of individual tree-ring series to show defoliation events in time

Produce a Gantt plot of individual tree-ring series to show defoliation events in time

plot_defol(x, breaks)

Arguments

x	a defol object produced by defoliate_trees().
breaks	a vector length two providing threshold (negative) ngsi values to separate minor, moderate, and severe defoliation events. If blank, the mean and 1st quartile are used.