Fig. 3
Weighted mean spectrum (first and third panels from the top) and Temporal Variance Spectrum (TVS1/2; second and fourth panels from the top) for the ARGUS sources VFTS 1028 and VFTS 1025. The red dashed curves indicate the 99% confidence level for variability. Significant variability is only seen in the nebular emission lines of VFTS 1028, but it is detected in several stellar lines in VFTS 1025.
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