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Two obvious questions, perhaps someone knows their answers:

* Is the gap a measurement artifact? (Presumably not). * Are there other, small gaps besides the Fulton gap discussed in the article?

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There is no (known) selection effect that would account for that gap. (And scientists have looked to find such selection effects). And yes, there is other gaps, e.g. a lack of systems with a planet at 0.2 AU (or rather in the range from 0.1 to 1.0 AU, separating the "hot jupiters" far in from the "normal" gas giants further out that we know from our solar system).

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