Fig. 8
Light curves of Ark 120 between October 2009 and March 2010. The B, V, and NB curves are as observed, the Hβ curve is computed by subtracting a scaled V curve from the NB curve (Hβ = NB − 0.5 V) and re-normalisation (mean = 1). For better visibility, the light curves are shifted against each other by + 0.2. The 2009 December data are mostly lost by strong wind preventing us from opening the dome.
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