code> <code>1998</code> <code>1999</code></p>
</dd>
<dt>year.rep</dt><dd><p>a factor with levels <code>1988:1</code> <code>1988:2</code> <code>1988:3</code> <code>1989:1</code> <code>1989:2</code> <code>1998:1</code> <code>1998:2</code> <code>1998:3</code> <code>1999:1</code> <code>1999:2</code></p>
</dd>
<dt>gp</dt><dd><p>a factor with levels <code>BRAEBURN1</code> <code>BRAEBURN2</code> <code>Fuji1</code> <code>Fuji10</code> <code>Fuji2</code> <code>Fuji6</code> <code>Fuji7</code> <code>Fuji8</code> <code