xstep</span><span class="p">,</span> <span class="n">marsclass</span><span class="p">,</span> <span class="n">purefc</span><span class="p">,</span> <span class="n">maxstep</span><span class="p">):</span>
    <span class="sd">&#39;&#39;&#39;Guarantees that the accumulation forecast step was set.</span>

<span class="sd">    Parameters</span>
<span class="sd">    ----------</span>
<span class="sd">    accmaxstep : str</span>
<span class="sd">        The maximum forecast step for the accumulated forecast field