Pixel-average cloud spherical albedo as a function of vertical cloud LWP, for three satellite overpasses for the first episode (Left), study area 25–30°W, 50–55°N, and for the second episode (Right), study area 20.25–23.625°W, 43.875–47.25°N, for indicated dates in April, 1987. Clusters of points at albedo ∼0.88 represent points with τc > 70 for which spherical albedo was calculated as if τc = 70. Curves denote cloud albedo for indicated constant values of effective radius near cloud top, re.