Ok, that seems right, but still, there is something that I do not understand. I followed the piece of code of the documentation of graph_tool.draw.get_hierarchy_control_points <https://graph-tool.skewed.de/static/doc/draw.html?highlight=get_hierarchy_control_points#graph_tool.draw.get_hierarchy_control_points> , and when I print the length of the map /cts/ I get value that are not divisible by 6 (86,50,38,62...), so there is one more point coming out of the function /get_hierarchy_control_points/ and used in /graph_draw/. But thanks for the clarification of the several spline segments. I didn't get that.
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