Problem with tick marks in lines.survfit (package survival)

I have attempted to follow posting guidelines but I have failed to find

what I am doing wrong here.
 I am trying to use lines.survfit to plot a second curve onto a survival
curve produced by plot.survfit. In my case this is to be a progression

survival curve superimposed upon an overall survival curve, but I will
illustrate my problem using the example given in the help for

 I would like to have tick marks for censored data points on both curves,

I would like to do something like:

 > fit <- survfit(Surv(time, status) ~ sex, pbc,subset=1:312)
plot(fit[2], mark.time=TRUE, xscale=365.24,

+ xlab='Years', ylab='Survival')

lines(fit[1], lwd=2, xscale=365.24, mark.time=TRUE)

 but when I do this, no tick marks appear on the second curve. Can anyone
see what I am doing wrong here?
 Rachel

[[alternative HTML version deleted]]