A passive high-resolution series was a type of scan available to Starfleet engineers, used to scan interstellar artificial objects.

In 2367, Commander La Forge and Lieutenant Barclay first attempted to scan the alien probe using a passive high-resolution series in the electromagnetic band from aboard the Feynman. The only radiation detected from the probe was visual, from 4500 and 7000 Ångstroms. (TNG: "The Nth Degree")

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