,
Convert a psd_lst to a (base) data frame.
# S3 method for psd_lst
as.data.frame(x, row.names = NULL, optional = FALSE, ...)A psd_lst object.
NULL or a character vector giving the row
    names for the data frame.  Missing values are not allowed.
logical. If TRUE, setting row names and
    converting column names (to syntactic names: see
    make.names) is optional.  Note that all of R's
    base package as.data.frame() methods use
    optional only for column names treatment, basically with the
    meaning of data.frame(*, check.names = !optional).
    See also the make.names argument of the matrix method.
Additional arguments to be passed to or from other methods.
A data.frame.
Other tibble: 
as_tibble.eeg_lst(),
as_tibble.psd_lst()