ytree.tree_farm.ancestry_short.above_mass_fraction¶
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ytree.tree_farm.ancestry_short.
above_mass_fraction
(halo, ancestor, fraction)[source]¶ Return only the most massive ancestor.
Parameters: - halo (halo data container) – Data container of the descendent halo.
- ancestor (halo data container) – Data containers for the ancestor halo.
Returns: Return type: True or False