1. To select variables that you are interested for the graphical representation you must click or connect above the name of the variable continuous to the vertical axis (horizontal).
2. If you want to compare the data in the variable presented with the data of the other variables available, you should click above the ordered pair (the point on the graph).
3. You can, also, choose the month of the year for which you are interested in the graphical representation by selecting the button "Todos los meses", located below the horizontal axis.