Fig. 1.
First three principal components. The first component (top panel) represents a single-wave light curve, the second component (middle panel) a double-wave light curve, and the third component (bottom panel) expresses antisymmetry. The points are real principal components and the solid lines are fits using Eq. (1) with A3 = 0 for the first two components and A1 = A2 = 0 for the thirdone.
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