Smoothing filters. In (a), "PO" stands for polynomial order of polynomial fitting in Savitzky-Golay filter. In (b), σ is the standard deviation. In (c), α determines the shape of Kaiser window. In (d), a is the scale of the wavelet.
Yang et al. BMC Bioinformatics 2009 10:4 doi:10.1186/1471-2105-10-4