Optimization for Bezier curve

New version of my iOS apps,
Baby Growth Chart
Baby Growth Chart Lite
were released the other day.
Both versions are 2.1.1, which are slightly fixed its percentile curves, which are drawn by cubic bezier curves.
I made the data by myself with my own tool app in the previous version. But the task were really tired.
So I fixed the tool to make data automatically. The tool changes points and control points slightly and gets difference with the value on bezier curve and the real value, and finds a minimum difference, this is the usual way of optimization, I guess.

Anyway my tool got new bezier curves.

Optimized bezier curves

↑They looks really nice. Babies usually lost weight after their birth, and the new version shows them nicely (the screen shot is the one in my tool).
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