Fig. C.1.

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The colour indices (B − V) (top panel) and (V − R) (bottom panel) of the total Knot 3 light (corrected for E(B − V) = 0.12, see text) versus its brightness in V band for all available photometric data. The total magnitudes VKn.3 of 20.17–20.19 mag correspond to several deep minima on the lightcurve of LBV after the ’giant eruption’. Respectively, the total magnitudes of Knot 3 of VKn.3∼19.96–20.03 mag correspond to the maxima of the LBV lightcurve in this period. The solid red lines, overplotted to the both panels, represent the expected changes of Knot 3 colour in the case if the (B − V) and (V − R) colours of the LBV change as a linear function of V(LBV) between quasi S-Dor minimum and maximum. The extremes correspond to an early B (as its (V − I) from the HST data at the epoch of December 2017, with V = 25.0 mag) and to late F near the local maxima, when V(LBV) ∼22.0 mag.
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