plotting on map

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Hi list,
I want to plot state Texas using map function. I wrote the following code to
plot the grid boundary for Texas:
################################
library(maps)
    require("mapproj")
    longlatLimit<-c(-106.65,  -93.53 ,  25.93 ,  36.49)
    par(plt=c(0,1,0,1),cex=1,cex.main=1)  #Set plotting parameters
    map(projection="azequalarea",
type="n",xlim=longlatLimit[1:2],ylim=longlatLimit[3:4])
    bound<-c(floor(.map.range[1]), ceiling(.map.range[2]),
floor(.map.range[3]), ceiling(.map.range[4]))
    map.grid(lim=bound,col="light grey")
####################################
Here is the problem I face:
1-I want the latitude boundary to be from 25 to 36 degree, but it goes from
25 to 32
How about this:

library(maps)
    require("mapproj")
    longlatLimit<-c(-106.65,  -93.53 ,  25.93 ,  36.49)
    par(plt=c(0,1,0,1),cex=1,cex.main=1)  #Set plotting parameters
    map(projection="azequalarea", type="n",xlim=longlatLimit[1:2],ylim=longlatLimit[3:4])
    bound<-c(floor(longlatLimit[1]), ceiling(longlatLimit[2]), floor(longlatLimit[3]), ceiling(longlatLimit[4]))
    map.grid(lim=bound,col="light grey")
2-When I copy the plot on pdf, the top of map will be shrinked
I appreciate if some one come back to me with solution.
when I wrap the above in 
pdf("test.pdf")
...
dev.off()

I see the full PDF, though there is extra space on the page around it.

I frequently use pdf2ps to get the tight bounds on the graphic when I'm
including it in latex:
$ pdf2ps test.pdf - | grep "^%%BoundingBox:[0-9 ]*$" | cut -f 2- -d ' '
84 222 452 493

which can be used like so: 
\includegraphics[width=0.9\linewidth,viewport=84 222 452 493]{test}
Regards,
Alireza

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