Fig. 5. The colour curve of U Sgr. A third-order Fourier series was fitted to the K light curve of Laney & Stobie (1992) and from this the K values at the phases of the V observations of Gieren (1981a) and Moffett & Barnes (1984) were obtained
![[FIGURE]](img130.gif)
![[FORMULA]](img4.gif)
colour curve of U Sgr. A third-order Fourier series was fitted to the K light curve of Laney & Stobie (1992) and from this the K values at the phases of the V observations of Gieren (1981a) and Moffett & Barnes (1984) were obtained