Script interface for the SizeBySpeedModule.
        This module controls the size of particles based on their speeds.
See Also: ParticleSystem, ParticleSystem.sizeBySpeed.
      
| enabled | Specifies whether the SizeBySpeedModule is enabled or disabled. | 
| range | Set the minimum and maximum speed that this modules applies the size curve between. | 
| separateAxes | Set the size by speed on each axis separately. | 
| size | Curve to control particle size based on speed. | 
| sizeMultiplier | A multiplier for ParticleSystem.SizeBySpeedModule.size. | 
| x | Size by speed curve for the x-axis. | 
| xMultiplier | Size multiplier along the x-axis. | 
| y | Size by speed curve for the y-axis. | 
| yMultiplier | Size multiplier along the y-axis. | 
| z | Size by speed curve for the z-axis. | 
| zMultiplier | Size multiplier along the z-axis. |