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Select All (the default) to evaluate the expression for all particles in the simulation.
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Select Fraction to evaluate for a fraction of all particles. Enter a scalar value between 0 and 1 in the Fraction of particles field. The default value is 1, which means that the evaluation includes all particles.
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Select Number to specify a number of particles to evaluate for in the Number of particles field. The default value is 100 particles. If the particle simulation contains fewer particles than the specified number, all particles are included.
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