Radial profile of time and space averages of various quantities close to the convective boundary. From top to bottom: the temperature T (in units of 6  ×  10⁶ K); the radiative conductivity χ divided by the luminosity enhancement factor of the model and by the constant 4  ×  10¹⁵; the radiative flux divided by the luminosity enhancement factor of the model and by the constant 2  ×  10¹²; the subadiabaticity ∇ − ∇_ad; the radial temperature gradient ∂T/∂r multiplied by the constant 2.8  ×  10³. The coloured curves correspond to the four models: ref (black), boost1d1 (blue), boost1d2 (magenta) and boost1d4 (red). The convective boundary corresponding to the Schwarzschild boundary from the 1D initial model is indicated by the vertical solid line.