The graph measures the temperature deviation in degrees Celsius along the vertical axis (From the bottom up: -0.3; -0.2; -0.1;0; 0.1; 0.2; 0.3; 0.4; 0.5; 0.6; 0.7), and the year along the horizontal axis (1980, 1985, 1990, `995, 2000, 2005) The blue curve shows the deviation in monthly average surface temperatures. The red curve shows a smoothed five-year average of the monthly data. Two sets of colored bars- El Niño and the volcanic eruptions of Mount Pinatubo