y which to colour the data. Updates
 the number of entries in the colour list if there are more values
 for this new attribute than previous ones.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>c</code> - the index of the attribute to colour on</dd></dl>
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<h4>setColours</h4>
<pre>public&nbsp;void&nbsp;setColours(<a href="../../../weka/core/FastVector.html" title="class in