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Question 50·200 Super-Hard SAT Reading Questions·Expression of Ideas

Computational imaging tools can make faded marks in medieval manuscripts easier to see, leading some researchers to describe the resulting images as recovered versions of the original pages. Yet the tools estimate missing pixels partly from patterns found in other documents. _____ the estimates can be tested against visible traces and results produced by other tools; they remain interpretations rather than direct observations of the damaged page.

Which choice completes the text with the most logical transition?