Four of 97 Kepler systems need two signal exclusions to fit one circular plane within three-error boxes

We test whether one signal exclusion resolves catalog duration conflicts with circular orbits in one common plane. The sample has 321 strong signals in 97 Kepler hosts. Four systems need two exclusions within three quoted errors. With an extra five percent duration allowance, one system still needs two: KIC 9950612, the known Kepler-220 system. Release 24 retains this result. A broad radius-ratio interval reduces the required exclusions to one in both releases. A circular construction with separate inclinations over 2.719 degrees reproduces its nominal release 25 durations. Thus, the diagnostic does not require an unexplained physical signal. An independent linear program agrees on 2,973 subset checks. These are selected catalog constraints, not confidence regions, false-planet counts or independent telescope confirmation. The package contains frozen inputs, exact source queries and hashes, all maximum compatible subsets, code, a figure and offline instructions. Job sci-1107-dell-astronomy-4ccb2e9c508b; topic astronomy; machine dell; model gpt-6.1-sol.

Kepler · transit duration · coplanarity · compatible subsets · catalog sensitivity · null discovery result