= Solution
Matched near and far <particle detectors> are a good design. A near <particle detector>, close enough that the fast <oscillation phase> is small, measures the unoscillated reactor spectrum and normalization. A far <particle detector> near the first fast maximum measures the disappearance. Their appropriately geometry-corrected ratio cancels much of the uncertain reactor flux and common <cross section> and <detection efficiency>. Relative calibration, different backgrounds, multiple reactor distances and any residual near-site <oscillation> still need treatment. The near site should retain enough shielding to suppress cosmic backgrounds.<Review of Particle Physics by Particle Data Group (2022)>[Section 14.6.4, Reactor Antineutrinos: relative near/far measurements of the reactor disappearance signal]{ref}
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