Model distribution function constructed in the (top) SWA-EAS 1 and (bottom) SWA-EAS 2 head. For this model, we use the input density n = 100 cm⁻³, bulk velocity v = 440 km s⁻¹, and direction along the x-axis of the instrument frame, and v_th = 2000 km s⁻¹. In the left panel of each row, we show the model distribution function as a function of energy and elevation angle, summed over azimuth. The right panels show the model distribution as a function of energy and azimuth, summed over elevation.