γ_ld=+2 · γ_lM=-5 · γ_dM=+14 · T=5.0 · λ=1.0  ·  A negative light–medium tension (γ_lM=−5) makes light cells prefer the medium and detach: light–medium contact climbs from 0.07 to over 0.5 while light–light and light–dark contact collapse; dark stays compact (Fig 25).