groupnorm

Only relevant when stackgroup is used, and only the first groupnorm found in the stackgroup will be used - including if visible is "legendonly" but not if it is false. Sets the normalization for the sum of this stackgroup. With "fraction", the value of each trace at each location is divided by the sum of all trace values at that location. "percent" is the same but multiplied by 100 to show percentages. If there are multiple subplots, or multiple stackgroups on one subplot, each will be normalized within its own set.