Rotation speed of the Z-axis of the SRG spacecraft in the ecliptic plane during the first two sky surveys. The spacecraft spins around the Z-axis with a period of four hours, thus performing the all-sky survey. Due to limitations on orientation of the spacecraft, the angle between the Z-axis direction and the Sun and Earth must not exceed 13 and 24 degrees, respectively. This condition defines the speed with which the Z-axis has to follow the Sun and Earth at any point in thehalo orbit around L2. Variation in the speed of the Z-axis causes variations in the exposure of the survey. Higher speed leads to lower exposures, and lower speed allows higher exposures of the corresponding sky regions. The vertical barsmark the dates of the gaps in the all-sky survey that are associated with orbit corrections and calibrations.