Altitude determination with method 4: results of the altitude determination using the method described in Sect. 3.1.4. The abscissa is the decimal hour. The three features followed here are the same as in Sect. 3.1.3. The solid lines represent the estimated altitudes of the features (green: F1, blue: F2, red: F3) over time after emergence. The error bars are ±16 km. The dashed lines represent the estimated altitude at emergence. Their error bars are km. They are shown at the beginning of this figure for the sake of clarity. In decimal hours, the exact times of emergence are t_o(F₁) = 10.16, t_o(F₂) = t_o(F₃) = 10.67, i.e. outside the abscissa range.