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CoordSystem XML tag
The syntax of the <coordSystem> tag is the following:
<coordSystem xZero="double" yZero="double" scale="double" yscale="double"/>
The attributes "xZero" and "yZero" give the screen position of the axes origin in pixels. The attributes "scale" and "yscale" give the length of one unit in pixel for the x-axis and y-axis respectively