Stellar SED plot for the MACS0451 arc. Note that the F140W photometic point can only get well fitted with the help of nebular emission in the case of Calzetti’s law (green). When using the SMC law (red), this flux is matched by the combination of a Balmer break and the line emission, but the χ2 is slightly larger than the Calzetti solution. The blue curve shows that fits without nebular emission can not produce enough flux to match the F140W point.
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