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Fig. 4
Distribution of standard deviations for HδA (upper panel) and of rms of noise around Hδ line as a function of the number of co-added spectra. The red dashed line represents 3 times the standard deviation calculated for spectra composed of all 360 galaxies (upper panel) and median rms of noise reduced by 
(lower panel).
This figure is made of several images, please see below:
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