ass="r-in"><span>  B <span class="op">=</span> <span class="fl">100</span>,</span></span>
<span class="r-in"><span>  reference <span class="op">=</span> <span class="fl">0</span>,</span></span>
<span class="r-in"><span>  contrasts <span class="op">=</span> <span class="st">"difference"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 
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