B and V light curves and B − V colour curve of Var C. Crosses: TLS plate data; filled upwards triangles: DIRECT; stars: NOAO; filled downwards triangles: WIYN; stars with six rays: TLS CCD data; filled squares: COoSAI; filled diamonds: Humphreys (1978), Humphreys & Warner (1978), Humphreys et al. (1984, 1988); open four-ray stars: Massey et al. (1995); open circles: Wilson (1991); filled circle: Spiller (1992); open squares: Szeifert et al. (1996); open upwards triangles: Macri et al. (2001); open diamonds: Mochejska et al. (2001); plus signs: Shporer & Mazeh (2006); filled five-ray stars: Viotti et al. (2006); filled small dots: Viotti et al. (2013); open small dot: Roberto Viotti, Franco Montagni (priv. comm.); open five-ray stars: John Martin (priv. comm.); filled four-ray stars: Humphreys et al. (2013b); and open downwards triangles: Valeev et al. (2013). Only data sets containing V band data were used in these plots. Only errors larger than 0.3 mag are shown.