</span><span class="n">GPMpolyCentroid</span><span class="o">.</span><span class="n">precipitationMaster</span> <span class="o">&lt;-</span> <span class="n">system</span><span class="o">.</span><span class="n">file</span><span class="p">(</span><span class="s1">&#39;extdata/GPMpolyCentroid&#39;</span><span class="p">,</span>
                                        <span class="s1">&#39;precipitationMaster.txt&#39;</span><span class="p">,</span>
                                        <span class="n">package