code: func (r *LambdaResults) RegionsData() map[string]AggData {
  	regionsMap := make(map[string]AggData)
  	for _, region := range r.Regions() {
  		regionsMap[region] = sumAggData(r.ResultsForRegion(region))
  	}
  	return regionsMap
  }
docs: // RegionsData aggregates the individual lambda functions results per region