I analyzed data of the two last measurements (entry 279), I made groups of 600 samples (1 minute) and I made the histogram for each group and the gaussian fit of the histograms.

I plot the fitted parameters of X/DC signal and Y/DC signal as a function of time (for each minute).

In blue the 0W pump data; in red the 9W pump data.

The thick line is the mean, the dashed lines are the mean ± sigma.