  Continuous distributions require a standard deviation and the number of</span>
<span class="sd">    sampling points. You can also specify the minimum and maximum values for</span>
<span class="sd">    the axis. If these are not specified, a limit is selected based</span>
<span class="sd">    automatically on the values with:</span>

<span class="sd">        min = values.min() - 3*std</span>
<span class="sd">        max = values.max() + 3*std</span>

<span class="sd">    Discrete distributions are assumed 