Model fits to the photometric measurements of the V1309 Sco progenitor in May 2007 (black symbols – see Table 4). Blue curves represent model A. Red curves represent model B. The parameters of the models are given in Table 3. Dotted curves represent the contributions from the star (maximum at shorter wavelengths) and the dusty envelope (maximum at longer wavelengths). Full curves represent the sum of the two components.