R code used to produce the graph shown below.

nd <- data.frame(start=c(0, 50, 0), stop=c(50, 250, 300), event=1, 
                 transplant=c(0, 1, 0), year=1, id=c(1, 1, 2)) 
plot(survfit(model, newdata=nd, id=id), 
     xlab="Time since admission (days)", ylab="Survival", 
     col=c("black", "blue"), conf.int=TRUE, lwd=3)