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Table 7

Comparison of stack and individual fitting results.

Age AV log    M  
(Gyr) (mag) (M)

All individually fit

Mean of indiv. 1.02    ±    0.11 0.76    ±    0.04 10.39    ±    0.04
Stack
σdiff 1.40 3.66 1.69

Old pop. observed

Mean of indiv. 1.10 ± 0.13 0.63    ±    0.04 10.41    ±    0.04
Stack 0.56    ±    0.16
σdiff 2.62 3.37 0.13

Young pop. only observed

Mean of indiv. 0.012    ±    0.001 1.51    ±    0.04 10.30 ± 0.05
Stack
σdiff 2.18 1.37 2.37

Notes. Table gives the best fit parameters for the mean and standard deviation of the mean of individually fit objects and the χ2-weighted parameters of the light stack of the same objects. The results at the top of the table are for the whole sample of 40 best fit objects, whereas the bottom gives the results for the two sub-samples of galaxies with only a single young population observed (6) or with an older population observed (34). The trends of ages and AVs decreasing when fitting a stack are obvious in the total and old sample.

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