Example of hot spot models of EBs: temperature distribution (left), synthetic Hα line profiles (middle), and CaII H line profiles (right). Dotted lines represent the temperature distribution of the C7 model of the quiet-Sun atmosphere and corresponding line profiles of the quiet Sun. The numbers above the plots denote the specific model numbers. We chose three representative models (4, 121, and 238 in upper, middle, and lower rows) in the beginning, in the middle, and in the end of the grid with the gas-density structure identical to that of C7 (see Sect. 4 for details). In the temperature plots (leftmost column), the heights are above the photosphere defined by τ₅₀₀ = 1 layer in the solar atmosphere.