Panel a: ratio of total variance to average seasonal variance vs. log . NC stars (blue diamonds), T stars (green crosses), C stars (red pluses). Blue dashed line represents the linear fit to the data of NC stars. Panel b: p is the density (i.e. number of stars per unit log ) of all stars, p_C is the density of the stars with cycles and p_T is the density of the stars having a linear trend. The solid black curve represents the percentage of C stars as function of log .