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When using the prefix field, enter as £ .
If your Data Source was formatted, either before it was imported or at the time of import, figures may already contain currency or percentage symbols. If you want to remove these from being displayed in your chart you could enter something like this in the Prefix or Suffix field
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if you need to do this, you must also remember to tick the ‘Display column as HTML’ box otherwise <b/> will be entered in the relevant field.