12 1 2 9 1 2 12 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ chl  : num  5.6 3.4 3.1 3.4 6.2 5.6 3.3 NA NA NA ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ dox  : num  NA NA NA NA NA NA NA NA NA NA ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ spm  : int  17 17 18 21 17 18 23 18 19 21 ...</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  $ ext  : num  1.6 1.6 1.6 1.9 1.6 1.6 2 1.6 1.7 1.9 ...</span>
<span class="r-out co"><sp