head</a></span><span class="op">(</span><span class="op">)</span>
<span class="co">#&gt;   investor  asset quantity    price            datetime    RG_value</span>
<span class="co">#&gt; 1    QZ621  DAX2S        0 0.000000 2012-02-22 11:36:00 0.006965944</span>
<span class="co">#&gt; 2    QZ621      F        0 0.000000 2012-02-08 18:30:00 0.006973225</span>
<span class="co">#&gt; 3    QZ621 LEVMIB      400 5.551628 2011-07-25 15:41:00 0.008168037</span>
<span class="co">#&gt; 4    QZ621 MINI1L        0 0.00