ColumnHeaders: This value specifies information about the data returned in the rows fields. Each item in the columnHeaders list identifies a field returned in the rows value, which contains a list of comma-delimited data. The columnHeaders list will begin with the dimensions specified in the API request, which will be followed by the metrics specified in the API request. The order of both dimensions and metrics will match the ordering in the API request. For example, if the API request contains the parameters dimensions=ageGroup,gender&metrics=viewerPercentage, the API response will return columns in this order: ageGroup,gender,viewerPercentage.