Angular distance (degree)
Figure 2. The brightness distribution along the line defined in Figure 1. Each number on the line corresponds to that in Figure 1. The ¿4 point is at angular distance = 0° in the cases of II and V. Noise fluctuation is under l.OS'io©. Enhancements at X = —7° ~ —8° in the cases of numbers IV and V are not real libration clouds (see Figure 1). No significant cloud with the size of about 6° appears.
existed in the previous observations. Further trials to detect them would be needed to study their existence in more detail.
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