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<pre>public final&nbsp;<a href="../../util/Opt.html" title="class in hydra.util">Opt</a>&lt;<a href="HeaderRow.html" title="class in hydra.ext.tabular">HeaderRow</a>&gt; header</pre>
<div class="block">The optional header row of the table. If present, the header must have the same number of cells as each data row.</div>
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