"density"(x, ..., log = FALSE, zeros.rm = TRUE)lengths, typically with the output of the function getlen.density.default.TRUE, the output density will be calculated for the logarithm of the lengths. It is TRUE by default.FALSE, the density will be estimated by including zero values. It is TRUE by default.density.lengths is returned. It contains objects of class density, the given direction of the stratum lengths and a logical value which points out if the density is computed for the logarithm of stratum lengths.getlen, density.default, plot.density.lengths, print.density.lengths