R help - Jan 2005 - Changing axis labels in plots of zph objects (survival analysis)

Hi,

I am using the Survival package, more precisely the cox.zph function, to plot
log(Hazard rate) over time.

if I type 

plot(temp.zph[2])

then I get the plot I want. However, I want to change the label of the y axis
that cox.zph prints.

plot(temp.zph[2],xlab='Days', ylab='log hazard for Fast recovery
cluster')

then I get 

Error in plot.default(range(xx), yr, type = "n", xlab =
"Time", ylab = ylab[i],: formal argument "xlab" matched by
multiple actual arguments

I don't understand because these ylab and xlab commands usually do the job!

thanks in advance,

M-P Sylvestre
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