All values are expressed in units of the base currency per unit of the target currency. Many European countries quote exchange rates this way. Time information is shown vertically and the currency series are shown horizontally. Thus, each of the time series appears in the columns of a table. This is the default.
Output is by time period, and by currency within each time period.
Time information is shown horizontally and currency series are shown vertically. Thus, the time series appear in the rows of a table. Output is by currency, and by time period within each currency. This format is useful for processing in some statistical software packages. Cookies expire automatically after three months.