The first 10 eigencurves identified by PCA for the zero-obliquity, spin-synchronous Warm Jupiter case. Brightness variations are approximately isolated to a single hemisphere, since the planet does not rotate very much over the duration of the secondary eclipse. The maps represent the simplest two-dimensional patterns that produce sinusoid-like one-dimensional variations in the light curve during ingress and egress, with time “wavelengths” in half-multiples of the ingress and egress durations. Even and odd eigenmodes are symmetric and antisymmetric, respectively, in reflection across the subobserver longitude.