Example results of data from a clock gene's RNA levels. A: RNA levels of a clock gene, TOC1, in a fri;flc background of A. thaliana seedlings. The data points have 2 h intervals and consist of two averaged biological replicates. The values are normalised to the average of the housekeeping gene ACTIN2 in wild type. BSA gives a clear result with a period, T, close to 23 h (C), while MTM (B) and FFT (D) struggle with the short time series and give no clear result.