[R] x-axis plot problem

[abotaha]

Hi all, 
I tried to have plot of many vector in one plot and i have got a nice plot
but i have problem with x-axis. I want to have month and year only(Jul.07
means July 2007) in x-axis without appearing other number behaind it. 

I would appercit any help.

The R code:

F<-c(7.49,6.91,6.78,6.99,7.44,7.42)
M<-c(4.81,4.51,5.21,4.65,4.75,3.86)
P<-c(7.49,15.03,15.19,15.32,15.42,15.45)
B<-c(16.24,15.87,12.94,11.82,10.86,9.61)

time<-c("Jul/07","Aug/07","Sep/07","Oct/07","Nov/07","Dec/07")
model<-data.frame(F,M,P,B)
row.names(model)<-c("Jul07","Aug07","Sep07","Oct07","Nov07","Dec007")
model

par(mgp=c(2, 1, 0),bty="o" )
matplot(model, pch = c(1,22,17,16), type = "o",lty=c(2,2,2,5), col
=c("gray10"," gray10","gray10","gray10"),xlab="Month-Year",ylab="Zinth",
xaxs = "i", yaxs = "i",main="Model Output")
legend("topleft", legend = c("F", "M","P","B"),text.width =
strwidth("1,000,000,"),pch=c(1,22,17,16),col =c("gray10","
gray10","gray10","gray10"),lty=c(2,2,2,5), xjust = 1, yjust = 1, bty="n",
cex=0.8, ncol=2)
axis(1, 1:6, row.names(model))
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