xlim.arg=NULL,# limits of x-axis; for visualisation only, not trimmimng data
ylim.arg=NULL,# limits of y-axis; for visualisation only, not trimmimng data
ribbon.lohi.arg=c('Lower','Upper'),
ribbon.lohi.arg=c('Lower','Upper'),# column names containing lower and upper bound for plotting the ribbon, e.g. for CI; set to NULL to avoid plotting the ribbon