1</span>), <span class='kw'>z1</span> <span class='kw'>=</span> <span class='fu'>ifelse</span>(<span class='no'>iows</span> <span class='kw'>==</span>
        <span class='fl'>2</span>, <span class='fl'>0</span>, <span class='fl'>5</span>), <span class='kw'>z2</span> <span class='kw'>=</span> <span class='fu'>ifelse</span>(<span class='no'>iows</span> <span class='kw'>==</span> <span class='fl'>2</span>, <span class='fl'>0</span>, <span class='fl'>10</span>), <span class='kw'>xll</span> <span class='kw'>=</