... Dtrend computes the mean, standard deviation, first derivative and second derivative for each parameter. ... DataSeeker can select data from user-specified time ranges or based on specific spacecraft states, then will merge data columns across different tables and deliver a FITS or RDB file. ... Plot derivative. ... Note columns 4 and 5 on the right, which show the linear fit slope of the data (first derivative) and the fit to the ``instantaneous'' slopes (second derivative), respectively. ...