{"version":"1.0","type":"rich","title":"Fork of Brush, Trendline, Legend, Linechart, Barchart","description":"Two time series of EPA groundwater monitoring data display water levels at a deep and shallow observation well. A linked brush chart below the main line chart filters the date range, and the main chart’s x-axis updates accordingly. A dashed trendline with its regression equation appears in the brushed region, while a legend identifies the two colored lines. The visualization uses d3.scaleTime, d3.line, d3.brushX, d3.nest, and a least-squares regression helper to compute the trendline from filtered data.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/7b4ee6e9f7a948c3a8461febaa70284d?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}