survmean## S3 method for class 'survmean':
lines(x, ...)survmean objectmatlines; you
may, therefore, supply e.g. lwd through this, though arguments
such as lty and col will not workplot.survmean.
If you want finer control over the plotted curves, extract the curves from
the survmean output using attr(x, "curves")
where x is a survmean object.