I cannot recall the source but somehow the name Brillinger comes to my mind.
The paired MATLAB script reads and plots the data, the periodogram and the ACF.

X coordinate of N. pole

Y coordinate of N. pole

MATLAB script dobrill.m You will need to comment the last line from brillx.txt and brilly.txt in order to use matlab's "load -ascii brillx.txt". Try it without commenting or cutting the last line. Also go to the complete program folder under Matlab scripts and programs to get files "newpgram.m" and "acf.m".

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