Different amcl's max_particles and min_particles give the same result

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I'm using amcl package to localize a mobile robot, recorded bag files for PR2. I've changed min_particles and max_particles several times then calculated the output difference with odomotry to evaluate these parameters. The table below demonstrate results; As you see, there is no notable change in the output and if you ignore the first row of the table, output variance is small.

And this is the Particle Filter output on the map