There are three examples in Champions Powers 6E that may be helpful.
Animal Spy: Remember When p31
Clairsentience (Sight, Hearing, and Smell Groups), Retrocognition (60 Active Points); Only Through the Senses of Animals (-3/4). Total Cost: 34 points
Speaking Statues p217
Clairsentience (Sight and Hearing Groups), Retrocognition (50 Active Points); Extra Time (1 Turn; -1-1/4), No Range (-1/2), Requires Appropriate Artwork (-1/2), Retrocognition Only (-1), Time Modifiers (-1/2). Total Cost: 10 points
Retrocognition: Eyes of the Past p247
Clairsentience (Sight and Hearing Groups), Retrocognition (50 Active Points); Retrocognition Only (-1), Time Modifiers (-1/2), Vague and Unclear (-1/2), Only Through the Senses of Others (-1/2). Total Cost: 14 points