spec_pgram: spec_pgram
In jkennel/waterlevel: Well Water Level Analysis Tools

calculate the spectra and cross-spectra

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spec_pgram(x, spans = NULL, kernel = NULL, taper = 0.1, pad = 0,
  fast = TRUE, demean = FALSE, detrend = TRUE, plot = TRUE,
  na.action = na.fail, ...)

`x`	univariate or multivariate time series.
`spans`	vector of odd integers giving the widths of modified Daniell smoothers to be used to smooth the periodogram.
`kernel`	alternatively, a kernel smoother of class `"tskernel"`.
`taper`	specifies the proportion of data to taper. A split cosine bell taper is applied to this proportion of the data at the beginning and end of the series.
`pad`	proportion of data to pad. Zeros are added to the end of the series to increase its length by the proportion `pad`.
`fast`	logical; if `TRUE`, pad the series to a highly composite length.
`demean`	logical. If `TRUE`, subtract the mean of the series.
`detrend`	logical. If `TRUE`, remove a linear trend from the series. This will also remove the mean.
`plot`	plot the periodogram?
`na.action`	`NA` action function.
`...`	graphical arguments passed to `plot.spec`.