Scatterplot of lithostratigraphic mapping of the top of the aquitard (in m below sea level) versus the manually interpreted top of the aquitard [17, 18], using A) <i>x</i>-means clustering and B) model-based clustering.

<p>Scatterplot of lithostratigraphic mapping of the top of the aquitard (in m below sea level) versus the manually interpreted top of the aquitard [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0176656#pone.0176656.ref017" target="_blank">17</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0176656#pone.0176656.ref018" target="_blank">18</a>], using A) <i>x</i>-means clustering and B) model-based clustering.