beginner question about pop

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I started learning houdini recently, and got this question.
I would like to know how to control birth position of particle,


here is my trial.


simply wanted to birth particle from surface of sphere, but some of particles born at near the surface.

is there are parameters to control this problem?

thank you for reading.

Attachments:
particle birth position.PNG (796.0 KB)

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Try switching “Jitter Birth Time” to None. If it doesn't work, you wanna post your file.
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