One node of the tree a hierarchy trace was drawn from, as plotly's calc leaves it on the first calcdata entry.
data.data is the calc entry for the sector — the double hop is d3's: the hierarchy wraps the stratified node, which wraps what plotly computed.
data.data
Optional
The magnitude d3 resolved, which is the one the sector was drawn at.
One node of the tree a hierarchy trace was drawn from, as plotly's calc leaves it on the first calcdata entry.
data.datais the calc entry for the sector — the double hop is d3's: the hierarchy wraps the stratified node, which wraps what plotly computed.