Sketch of secular SFH of a galaxy that does not display a secondary burst event. The orange dashed line corresponds to the time from the beginning of the SFH (t = 0) to the time at which the galaxy was observed (tobs), while the red dashed line corresponds to the peak of the secular SFH. Since the galaxy experienced no burst events, the look-back time to the peak of the secular SFH coincides with the look-back time to the latest peak of star formation .
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