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Caption: Figure 3.
Left: optical light curves of CVSO 109. Data from Konkoly Observatory, AAVSOnet, OACt, and ASAS-SN are denoted with circles, squares, triangles, and stars. Vertical dashed and dotted lines mark the epochs of HST and VLT observations. In the bottom panel, the black curve displays the TESS data. Upper right: color–magnitude diagram for CVSO 109. Lower right: color–color diagram for CVSO 109. In the right panels, lines fitted to the data points are also plotted. The short lines in the upper-right panel indicate how an increase of 0.2 mag in AV would change the colors for R = 3.1 (solid lines) or for R = 5 (dotted lines).
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