Variation in bolometric albedo, superheating factor, and color with elevation H. Data obtained with phase angle α = 83–90° are considered. The color is a function of the heliocentric distance, as given by the color bar. Only data with TEST_3.0 < 1.35 are plotted. Those with TEST_3.0 < 1.1 are shown with large squares. The dashed lines correspond to a power law (for albedo: ∝ H^{−0.39±0.01}) or a linear fit (for superheating factor and color) to the data points with TEST_3.0 < 1.1.