The LHS object containing the simulation results to be plotted.
stack
If the results is a data.frame with several variables, stack=FALSE generates
a series of plots, and stack=TRUE generates a single plot with the ECDF from
all variables identified by different colors.
index.res
An optional vector indicating which columns from the results are to be plotted.
col
An optional vector indicating the colors to be used.
...
Additional parameters to be passed to the lower level plotting function.