How much prestige is required before you get the possibility of intruders?

How much prestige is required before you get the possibility of intruders? - Thank You Signage

As per the in game assistance regarding Intruders:

Intruders are criminal elements that will sometimes try to take over your base. They will come in Colonist or Visitor ships once your colony has reached a certain prestige.

Since prestige is a number ranging from 0 to 1000, how much prestige exactly is required before you get the possibility of intruders?






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