Notes. Frequencies belonging to the same group (multiplet) of frequencies are indicated by curly brackets. Large fonts denote frequencies fitted to all data, while small fonts denote frequencies fitted to seasonal data (if detected above the local seasonal detection threshold of 0.027 ppt) and labelled with s1, s2, s3, s4 in the second column. Asterisks mark frequency amplitudes below all data 0.01743 ppt detection threshold, but above the local one (see Fig. 7). Fitting errors are given in () brackets.