Hi,
by taking the particle propety like Coordinate : Y we are getting the position of the particle center. From your shematic figure, you would like to get the height besed on the particle surface.
For spheres, you would need to create a new Variable for particles, called particle property by adding the Coordinate : Y with the Particle Size/2. Then you time plot the Maximum over time.
For a spacial average height value, one idea is to map a eulerian statistics of the newly created "surface coordinate"
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