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Plotly.js v3 removed string format for title attributes (plotly/plotly.js#7212). All titles must now use object format: { text: "..." } Changes: - Main layout title: string → { text: "..." } - Scene axis titles (xaxis, yaxis, zaxis): string → { text: "..." } - Colorbar title: string → { text: "..." } Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>