[R-sig-Geo] How to mask out

[José]

Hello

I am traying to interpolate several rainfalls 
data over the Iberian Peninsula and display the 
results over a map of the Peninsula. I have used 
the akima package to make the interpolation and 
the maps package to draw the map. My cuestion is 
whow may I  mask out the output of the interp.new 
function (with extrapolation) with the iberian 
Peninsula map provided by the map package in 
order to restrict the image to the Iberian 
Peninsula ? . Any suggestions are wellcome

Thank in advance for your help

Agustin
-- 
José Agustín García
Departamento de Física, Universidad de Extremadura
06071 Badajoz, Spain
Tfn. +34-924-289536, Fax. +34-924-289651, email agustin at unex.es