anchor: ParticleSystem:getSizes
  Gets the series of sizes by which the sprite is scaled. 1.0 is normal size. The particle system will interpolate between each size evenly over the particle's lifetime.
  size1, size2, size8 = ParticleSystem:getSizes()
  size1 number The first size.
  size2 number The second size.
  size8 number The eighth size.