This module computes the bounding box\index{bounding box} 
enclosing a set of Fcurves. The output
$xmin$, $xmax$, $ymin$ and $ymax$ are the minimum and maximum
values taken by the $x$ and $y$ coordinates over all points of all curves.
If the \verb+-z+ option is used, then the size of the bounding box is 
magnified by $z$ along each axis (the center of the box being kept). 
If requested, the bounding box is stored in a Fcurve.

