A homogeneous earthen embankment has an upstream water level of 12 m. The top width of the embankment is 3 m, and its upstream and downstream slopes (horizontal: vertical) are 2:1 and 2.5:1, respectively. A freeboard of 2 m is provided. The coefficient of permeability of the fill material is 2.5 × 10⁻⁵ m.s⁻¹. If a 20 m long horizontal filter is placed inward from the downstream toe, the seepage discharge per unit length of the embankment is n × 10⁻⁵ m³.s⁻¹.m⁻¹. The value of n is ________. (Rounded off to two decimal places)