a.frame</a></span><span class="op">(</span></span></span>
<span class="r-in"><span>  dx_col <span class="op">=</span> <span class="st">"F10.10"</span>,</span></span>
<span class="r-in"><span>  px_col <span class="op">=</span> <span class="cn">NA</span>,</span></span>
<span class="r-in"><span>  drg_col <span class="op">=</span> <span class="st">"896"</span></span></span>
<span class="r-in"><span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><sp