code: func (s *Series) GetUnitsOk() (UnitPair, bool) {
  	if s == nil || s.Units == nil {
  		return UnitPair{}, false
  	}
  	return *s.Units, true
  }
docs: // GetUnitsOk returns a tuple with the Units field if it's non-nil, zero value otherwise
  // and a boolean to check if the value has been set.