{"version":"1.0","type":"rich","title":"Trend line with legend","description":"This example displays two time-series line charts of water level data from wells OW2DWL and OW2DSWL, with an orange and blue color legend. The lower chart supports brush-based selection, which filters the upper chart’s time range and overlays a dashed grey trend line computed via least-squares regression. The visualization uses D3 v5 APIs including `scaleTime`, `scaleLinear`, `scaleOrdinal`, `line`, `nest`, `brushX`, and `axisBottom`, rendering to SVG.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/0cc07cd032394a0696a46afc62afc08c?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}