Contour Plot with CSV Data
This example displays a contour plot of CSV data, mapping points based on their xi and yi coordinates with zi values represented through colored contour lines and labels. The visualization uses the Plotly.js library via `Plotly.newPlot` to render the graph inside an HTML div element, while d3.csv loads the data from an external file. The contour plot features a Rainbow colorscale, smoothed lines, and axis ranges automatically computed from the dataset’s maximum values, with labels displayed directly on the contour lines.