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## Description
Stacked bar chart example
## Code
```ruby
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet(name: 'Bar Chart') do |sheet|
sheet.add_row ['A Simple Bar Chart', 'X', 'Y']
sheet.add_row ['A', 3, 4]
sheet.add_row ['B', 10, 6]
sheet.add_row ['C', 7, 2]
sheet.add_chart(Axlsx::BarChart, start_at: 'A6', end_at: 'F20') do |chart|
chart.add_series data: sheet['B2:B4'], labels: sheet['A2:A4'], title: sheet['B1']
chart.add_series data: sheet['C2:C4'], labels: sheet['A2:A4'], title: sheet['C1']
chart.bar_dir = :col
chart.overlap = 100
chart.grouping = :percentStacked
end
end
p.serialize 'stacked_bar_chart_example.xlsx'
```
## Output
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