Performs calculations with tree taper (or stem profile) equations, including model fitting. The package implements the methods from García, O. (2015) "Dynamic modelling of tree form" < http://mcfns.net/index.php/Journal/article/view/MCFNS7.1_2>. The models are parsimonious, describe well the tree bole shape over its full length, and are consistent with wood formation mechanisms through time.