title: Basic question about accessing an array column
body: <p>Sorry if this is a duplicate, tis quite basic.
  Ive made an array from a csv with d3 as follows</p>
  <pre><code>d3.csv('/data/multiculture.csv').then(function (rawData) {
  rawData.forEach(function (d) {
  areaData[d.lga_code] = d.ppl_who_believe_multiculturalism_makes_life_better_perc;
  });
  </code></pre>
  <p>this data looks like</p>
  <pre><code>20110: &quot;59.7&quot;
  20260: &quot;40.3&quot;
  20570: &quot;45.6&quot;
  20660: &quot;51.6&quot;
  20740: &quot;43.5&quot;
  20830: &quot;33.7&quot;
  20910: &quot;58&quot;
  </code></pre>
  <p>I need to access only the second column to make a scale</p>
  <pre><code>colourScale = d3.scaleQuantile().domain(areaData.???).range(['rgba(244,239,67,0.9)', 'rgba(243,205,69,0.9)', 'rgba(243,171,71,0.9)', 'rgba(242,137,73,0.9)', 'rgba(242, 69, 78,0.9)']);
  </code></pre>
  <p>but I am not sure how to access it, thanks in advance!</p>