[R] How to change axis line color in xyplot()

[liuzzz6]

Hi all,

I tried and searched a lot to find a way of changing color of axis line in
applying xyplot() function.
Take following code as example:

library(lattice)
par(col='white')
par(col.axis='white')
par(col.lab='white')
z = data.frame(x = 1:5) 
xyplot(x~x, z) 

The par(col.axis='white') has no effect on the result plot. 
Is there any way to change the color of axis line? 
Thanks in advance.

Regards,
Black 

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