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Fig. A.1.

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Different extractions of the new, SOAR spectrum of ZF20aaglfpy. The spectrum extracted along the slit with a 1″ length along the spatial axis, labeled "small" in the figure, has just a slightly stronger broad Hα line than the spectrum extracted from a longer, 3″ region ( labeled "large"). It is also very similar to the spectrum of the difference between both (labeled "diff"). The "SDSS-like" spectrum is the sum of "large" plus two times "diff" and should account for all the light in the 3″ aperture of the SDSS spectrum, even including additional starlight. The broad component in Hα is still very significant in this compound spectrum.

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