Seasonal distribution of the GW activity. Upper row: coverage of the ACS measurements as a function of the solar longitude L_s and latitude. The colors indicate the local time of observations. Middle and lower rows: seasonal-altitude distribution for the GW drag and potential energy (per unit mass), correspondingly. The left and right columns present the data for the northern and southern hemispheres, respectively. The gray area denotes the period of GDS. Red dashed lines separate the Martian years MY34, MY35, and MY36.