CONTRIBUTORS.md
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 # Bradley Jones
 
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 + ape unrooted layout
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   - <https://github.com/YuLab-SMU/ggtree/pull/273>
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 + `ggdensitree` function
   - <https://github.com/YuLab-SMU/ggtree/pull/253>
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 + made data usable with treedata in 'equal_angle' and 'daylight' layouts 
   - <https://github.com/GuangchuangYu/ggtree/pull/201>
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 # Justin Silverman
 
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 + `geom_balance`
 	- <https://github.com/GuangchuangYu/ggtree/pull/64>
 
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 # JustGitting
 
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 + Annotation functions (`geom_hilight_encircle` & `geom_cladelabel2`) for
   unrooted layout
   - <https://github.com/GuangchuangYu/ggtree/pull/152>
 + Add daylight layout for unrooted trees
   - <https://github.com/GuangchuangYu/ggtree/pull/124>
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 # Watal M. Iwasaki
 
 + Refactor layoutDaylight
   - <https://github.com/GuangchuangYu/ggtree/pull/165>
   - <https://github.com/GuangchuangYu/ggtree/pull/169>
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 # Ruizhu Huang
 
 + extend `gheatmap` to support collapsed nodes
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   - <https://github.com/GuangchuangYu/ggtree/pull/243>