Timing charts for the X-ray exposure and readout of the CCDs: conventional (upper) and continuous-rotation (lower) methods. The vertical and horizontal axes represent the speed of the crystal rotation and lap time, respectively. The numbers indicated in the charts correspond to the frame number. Letters denote the states of crystal rotation: A, acceleration; B, constant speed; C, deceleration; D, stop. S and S′ denote the start and end time of the crystal rotation, respectively. The regions filled by oblique lines correspond to the exposure for the detector.