Fit of the coefficients of the Brendel oscillator model for the dielectric function of solid SiO at a number of temperatures by a linear temperature variation. The various data points correspond to data from Tables 1 and 2 for oscillator parameters at different temperatures. Full lines show the linear fit (3). The vertical dotted line indicates the limit between the temperature ranges where data are obtained either from thin films made by vapour deposition on a substrate with given temperature or from thin films deposited at low temperature and annealed at high temperatures.