In Spacedock, an energy sheath (p. 21) is listed as being able to make detecting a ship or reading what's inside it difficult; a sensor-reflective hull (p. 22) makes it impossible to scan the interior of the ship. But... wasn't it the other way around?
I seem to recall the Cardassian freighters of "The Wounded" (TNG 4th season) as having a "high-energy subspace field" -- I watched it recently in Portuguese and am translating from the words they used -- that prevented the sensors from scanning the cargo holds. In "Gambit" (TNG 6th season), I remember Data saying that the pirate ship had a sensor-reflective hull that made it invisible to long-range sensors. So, the energy sheath seems to have the effect of a sensor-reflective hull and vice versa.
Is that right or is my memory failing me? Of course, this is a nitpicking exercise, but it sort of stuck in my mind.
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"As long as you can laugh, you are not
defeated."
–- Jack Vance