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Fig. 1
Variability of ϵ Ori on a daily timescale (from 16 to 25, October 2007). Upper panels: individual spectra in black (each spectrum corresponds to a night average) and global average spectrum in red. Lower panels: temporal variance spectrum, together with the one-sigma (dashed line) and three-sigma (dot-dashed line) limits.
This figure is made of several images, please see below:
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