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Questions, suggestions and "your chart disagrees with my favourite brand" — all welcome. (That last one usually becomes a sourcing note on the chart page.)
The form below composes an email in your own mail app, addressed to Ian Welkins — nothing is transmitted until you press send in your app, and if no mail app opens, the form shows you the message text to copy and send yourself. For a wrong figure specifically, the report-error form asks the two extra questions that make a correction fast.