<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>in</code> - The Data input object to read from.</dd>
<dd><code>nRows</code> - The number of rows in the read groups.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>Return a List containing the ColGroups from the DataInput.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/IOException.html?is-external=true" title="class or interface in java.i