The parametric space of an isothermal intracluster medium in which the classical conduction-limited TI (light yellow) and the LaTI regime (light purple below the solid indigo line) are shown. The classical conduction-limited TI must occur between the orange solid and orange dashed lines where the latter marks the size limit of TI modes for a given radius (k_ℓR ∼ 1). The solid red line marks the anomalous conduction regime k_ℓβ_eλ_e ∼ 1. The purple and red lines move up and down, respectively, with higher T_vir and β_e.