Simulated shown in Figure 1.21a of Woodward, Gray, and Elliott text. It illustrates the fact that frequency information is displayed better in the spectrum than the autocorrelations.
data("fig1.21a")
The format is: num [1:250] -0.89 -3.209 0.929 -0.763 -1.972 ...
"Applied Time Series Analysis with R, 2nd edition" by Woodward, Gray, and Elliott