Reference value is a benchmark value used to compare each slice’s value against its own "Reference value". Once added, it will add ▲, ◆, ▼ symbols in the detail labels indicating the difference trend.
The comparison is performed per slice, so each slice shows whether its current value is above, equal to, or below its reference. By default ▲ indicates a positive difference (value > reference), ◆ indicates no change (value == reference), and ▼ indicates a negative difference (value < reference).
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