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Parallel coordinates
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<div class="header">Definition</div>
A data point in m-dimensional space is represented by a polyline
with vertices on the parallel axes.<br> 
The position of the vertex on the i-th axis correspond to the 
i-th coordinate of the data point.

<div class="header">Parameters</div>
In the right slots, the numerical fields to be displayed.<br>
In the left slot, an option categorical field used to color the lines.<br>

<div class="header">Options</div>
Option 0: Horizontal orientation. The variables are displayed from left to right,
the values are displayed from bottom (minimum) to top (maximum).<br>
Option 1: Vertical orientation. The variables are displayed from top to bottom,
the values are displayed from left (minimum) to right (maximum).<br>
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