_21.png"></span>- and <span class="inlinemediaobject"><img src="../../../images/accumulators/form_22.png"></span>-quantiles. Their positions are equal to the number of samples that are smaller or equal to the markers. Each time a new samples is recorded, the positions of the markers are updated and if necessary their heights are adjusted using a piecewise- parabolic formula.</p>
<p>For further details, see</p>
<p>R. Jain and I. Chlamtac, The P^2 algorithmus fordynamic calculation of quantiles and histograms