Mode parameter variation as a function of time for linewidth. (Top, left), power (top, right), height (bottom, left) and energy rate (bottom, right). The continuous black line is for the globally fitted data with a free background, while the dotted line is for a fixed background. The correction of the parameters obtained for a fixed background is shown as an orange line; the correction is performed like in Appourchaux et al. (2014). The red lines shows the linear fit of each parameter to the 10.7 cm flux.