Perdiou et al. (2016) analysed two data-series from a 60 m Campanian chalk interval in the Adda-3 well offshore Denmark with the objective of identifying orbitally forced cycle periods and thus time-calibrating this part of the Campanian. The data are (1) a series of 457 gamma-ray (GR) log values (vertical spacing 0.1524 m), and (2) a series of 844 X-ray fluorescence measurements of Fe concentration from core at an average resolution of 0.07 m (but with several gaps in the data). Perdiou et al. used Thomson's multi-taper method (MTM) to generate their periodograms. They then used the Matlab function Redconf...

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