Element id → every index into categories it belongs to (a clash element under two rules is in two).
Source-data revision, stable across cross-filtering of the same dataset.
Rows the spec could not place (missing dimension value).
OptionalunitDisplay unit of the summed column, when the measure is a sum.
OptionalunmeasuredBucketed rows that contributed no finite value to a sum.
OptionalunsupportedRows whose selected dimension, stack, or measure was non-scalar/incompatible.
Category axis in display order; every series aligns to it.