Equation Icon  ( ) ( ) ( ) 1-- ∂-𝒮ext 1-- ∂-𝒮ext 1-- ∂𝒮ext T = ∂𝒥 , T = ∂𝒬 , T = ∂𝒬 . ϕ 𝒬e,m e e 𝒥 ,𝒬m m m 𝒥 ,𝒬e