This example shows a contour plot of three-dimensional data loaded from a CSV file, with labeled contour lines and a rainbow color scale. The visualization maps the `xi`, `yi`, and `zi` columns from the data file to x, y, and z coordinates, using Plotly’s `newPlot` function to render the plot. The code calculates the maximum x and y values from the data to set axis ranges, and configures the plot with smooth contouring, visible labels, and white font for the contour annotations. The layout includes custom margins and a title, with the chart rendered inside a div element in the HTML page.