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## Description
Line chart example
## Code
```ruby
require 'axlsx'
p = Axlsx::Package.new
wb = p.workbook
wb.add_worksheet(name: 'Line Chart') do |sheet|
sheet.add_row ['X-Y', 'X', 'Y']
sheet.add_row ['A', 3, 7]
sheet.add_row ['B', 10, 2]
sheet.add_row ['C', 7, 6]
sheet.add_chart(Axlsx::LineChart, start_at: 'A6', end_at: 'F20') do |chart|
chart.add_series data: sheet['B2:B4'], title: sheet['B1'], color: '0000FF'
chart.add_series data: sheet['C2:C4'], title: sheet['C1'], color: 'FF0000'
end
end
p.serialize 'line_chart_example.xlsx'
```
## Output
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