Notes. Initial parameters of the group I models, with an increasing length L in the central part of the loop. The initial electron temperatures (logK) and densities (logcm⁻³) at the apex are respectively indicated for an initial cool (T_iCL, n_iCL) and hot (T_iHL, n_iHL) loops in equilibrium. For the cool loop in equilibrium, the pressure at the top of the vertical chromospheric legs is given by P₀ (dyne cm⁻²). H₀ (erg cm⁻³ s⁻¹) is the uniform and constant term of the atmospheric heating H. The impulsive heating has an maximal amplitude A_max (erg cm⁻³ s⁻¹), a spatial standard deviation σ_ev (Mm), and a central position s_ev (Mm). The latter is given with respect to the center of the loop $L_{\mathrm{mid}}=L_{\mathrm{c}}+\frac{L}{2}$ (Mm). The column “iCL → fHL” indicates whether the initial cool loop has evolved into a final hot loop (marked as fHL) following the impulsive heating. Constant terms over a column are indicated by blanks, and N/a means that no hot loop in equilibrium could be built with the given parameters.