Enhancement of pixel-average cloud spherical albedo Δαsph on April 5, 1987, relative to that on April 2, as a function of LWP, for the study area 25–30°W, 50–55°N. Δαsph was evaluated for each datum of April 5 as the difference between αsph obtained by Eq. 2 from τc and re obtained from satellite data for that date and the value at the same LWP calculated by using a linear fit of τc to LWP for the April 2 data. Data points for τc > 70 (592 data of a total of 6,443) were calculated for τc = 70 and lie along the diagonal line at the upper right of the cluster of points.