I have a working d3.js visualization that shows data return rates as a composite line and area graph (https://anf.ucsd.edu/tools/data_return_rates/).I have a working d3.js visualization that shows
阅读背景：
d3.js线和面积图 - 想要添加由两个点定义的额外线并表示阈值/最小值（为了便于查看）
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