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Brush, Trendline, Legend, Title, Linechart, Barchart

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LLiuXiangYuan
Last edited May 3, 2019
Created on May 3, 2019

This interactive D3 v5 visualization compares groundwater levels at two EPA monitoring wells against effective rainfall in a swamp marsh, using a main line chart with a linked brush chart and vertical bar histogram. Users brush a time range in the lower chart to filter the main view, which recomputes a dashed trendline via a least-squares regression function and displays its equation. The upper SVG rendering includes dual y-axes, a categorical color legend, and derives data from external CSV files parsed with `d3.timeParse` and plotted with `d3.line`, `d3.brushX`, and `d3.axisBottom`.

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MIT Licensed

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