Initial wave speed, v₁, versus mean wave acceleration, (left), and power-law index, δ (right). Filled light green circles represent the EIT waves measured by Thompson & Myers (2009), red diamonds the EIT waves associated with the Moreton waves discussed by Warmuth (2010), and dark green triangles the EUVI waves presented in this paper. All parameters are derived from observations in the 195 Å  channel. The dashed ellipses denote the three proposed wave classes: class 1 events are initially fast and strongly decelerating waves, class 2 waves have moderate, nearly constant speeds, and class 3 events are very slow.