title: R crop raster data and set axis limits
body: <p>With your help in another thread I have managed to plot some global maps. First I convert meteorological GRIB2 data to Netcdf and then plot the global maps. </p>
  
  <p>Now I want to plot just a subregion of the map. I have tried crop command and succesfully extracted the subregion of the global nc file. But when plotting I can't find how to control axis limits. It plots a map bigger than data region so big white spaces appear on both sides.</p>
  
  <p>This is the script I'm using to plot maps</p>
  
  <pre><code>library("ncdf")
  library("raster")
  library("maptools")
  
  DIA=format(Sys.time(), "%Y%m%d00") # Data d'avui
  url=sprintf("ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/gfs/prod/gfs.%s/gfs.t00z.pgrb2f00", DIA) # Ruta del ftp
  loc=file.path(sprintf("%s",url))
  download.file(loc,"gfs.grb",mode="wb")
  
  system("/usr/bin/grib2/wgrib2/wgrib2 -s gfs.grb | grep :TMP: | /usr/bin/grib2/wgrib2/wgrib2 -i gfs.grb -netcdf temp.nc",intern=T)
  
  t2m &lt;- raster("temp.nc", varname = "TMP_2maboveground")
  rt2m &lt;- rotate(t2m)
  t2mc=rt2m-273.15
  
  DAY=format(Sys.time(), "%Y%m%d") # Data d'avui
  
  e=extent(-40,40,20,90)
  tt=crop(t2mc,e)
  
  png(filename="gfs.png",width=700,height=600,bg="white")    
      rgb.palette &lt;- colorRampPalette(c("snow1","snow2","snow3","seagreen","orange","firebrick"), space = "rgb")#colors
      plot(tt,col=rgb.palette(200),main=as.expression(paste("Temperatura a 2m ",DAY," + 00 UTC",sep="")),axes=T)
  dev.off()
  </code></pre>
  
  <p>that give this output.</p>
  
  <p><img src="https://i.stack.imgur.com/DOyZr.png" alt="cropped plot"></p>
  
  <p>It has to be a simple one but I am a simple R user. Thanks in advance.</p>
  
  <p>EDIT: New output when adding xlim=c(-40,40),ylim=c(20,90) as suggested. It seems it does not fix the problem. But playing with x,y size of the output png file looks promising as I can adjust size to fit the map.For sure it has to be another solution, the right one I can't find.</p>
  
  <p><img src="https://i.stack.imgur.com/xsh9Y.png" alt="enter image description here"></p>