ss="p">],</span>
<a id="__codelineno-5-9" name="__codelineno-5-9" href="#__codelineno-5-9"></a>    <span class="n">price_observable_columns</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;cost&#39;</span><span class="p">,</span> <span class="s1">&#39;freq&#39;</span><span class="p">,</span> <span class="s1">&#39;ovt&#39;</span><span class="p">,</span> <span class="s1">&#39;ivt&#39;</span><span class="p">]</span>
<a id="__codelineno-5-10" name="__codelineno-5-10" href="#__codeline