Table 2: Observed and model colors with filter  F547M as the zero point. The observed colors are here corrected for foreground Galactic extinction. The three models (a), (b) and (c) shown here stand for  $m_{\rm up}=120$ $M_{\odot }$, Z=0.004, and respectively, $\alpha =1$, 1 and 2.35 and $\tau =2$, 3 and 4 Myr. We also show the three tested extinction laws in the form  $f(\lambda )=A(\lambda )/E_{B-V}$. The color differences  $\Delta (M_y-M_\lambda )$between the observations and a given model were to be well fit by a function of the form  $a+E_{B-V}f(\lambda )$ for the tested extinction law to be accepted.
Filter F547M F439W F336W F170W
$\lambda $ (Å) 5470 4300 3330 1740
Obs.  $M_{547}-M_\lambda$ 0.00 0.84 1.48 3.03
   $\pm$0.03  $\pm$0.03  $\pm$0.04  $\pm$0.05
$M_{547}-M_\lambda$ (a) 0.00 0.96 1.85 4.10
$M_{547}-M_\lambda$ (b) 0.00 0.87 1.49 3.22
$M_{547}-M_\lambda$ (c) 0.00 0.82 1.19 2.94
$f(\lambda)$ (Galactic) 3.21 4.18 5.06 7.80
$f(\lambda)$ (LMC) 3.10 4.13 5.37 9.25
$f(\lambda)$ (SMC) 2.72 3.65 4.65 10.51

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