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Fig. 7

image

Time behavior (from top to bottom) of the total luminosity, photospheric luminosity, stellar radius, and effective temperature in model 18 without accretion bursts (left column) and model 23 with strong accretion bursts (right column). The red, green, and blue lines correspond to the cold, hot, and hybrid accretion scenarios. The vertical dotted lines define the zero-point ages when protostars accumulate 95% of their final mass.

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