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* warping of the whole chart (normal grid, sine, triangle).
* show or hide pedigree collapse.
* unique line color or coloring based on surname.
* line fading represents the uncertainty of dates or the age.
* show or hide lables for birth, death, marriages
* line weighting (only descendant diagram).
* optimizations (only ancestor diagram):
** flip family to reduce the cross chart connection lengths.
vertical chart compression.
* softness of the family shape.
* vertical flipping of the whole chart.