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Fig. 4


Stellar flux evolution in the 3.6 (top), 4.5 (middle), and 8.0 μm (bottom) IRAC channels. The stellar flux slightly fluctuates with time in the 3.6 and 4.5 μm bandpasses, and is constant at 8.0 μm. A different inter-pixel map is used for the Warm mission data. The Warm Spitzer phase is shaded in pale pink for clarity. The flux modulation is probably due to the uncorrected intra-pixel effect and to the calibration uncertainties, which are not displayed here for clarity.

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