f_{halo}
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  1. https://formula.s21g.com/?f_%7Bhalo%7D.png
  2. http://formula.s21g.com/?f_%7Bhalo%7D
  3. https://formula.s21g.com/?f_%7Bhalo%7D
  4. http://formula.s21g.com/?f_%7Bhalo%7D.png
  5. http://formula.s21g.com/