Resolution test of the detonation conditions of the merger of two white dwarfs of 0.90   M_⊙ and 0.89   M_⊙ with an initial period of 25   s. The left panel shows a simulation with 2 × 10⁶ particles, the simulation shown in the right panel contains 10⁷ particles. Both panels show a density slice after the system has evolved for 32   s. The black stars mark all particles with temperatures above 2 × 10⁹   K.