English: Kinematic boundaries of the Dalitz plot for a three-body particle decay of a spin-0 particle of a mass M in three spin-0 particles of masses m_1, m_2, m_3. The grey area depicts the allowed kinematic region. The blue line shows the position of accumulation of events in case a spin-0 resonance is present as an intermediate state in this three-body decay, which then decays to particles 1 and 2. The orange line shows the position of accumulation of events in case another spin-0 resonance is present, decaying to particles 1 and 3.