Fig. 2

A comparison between the standard sky subtraction applied in the data reduction previous to combining the individual datacubes (magenta line) and the sky subtraction applied after constructing the final datacube (green line), for the SMG of BR1202-0725. The latter method is the one used in this work. The wavelengths of the [O ii] doublet are shown in vertical dashed black lines and dotted vertical lines indicate sky lines.
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