  The Tartarus database contains products for 529 ASCA observations of active
galactic nuclei. We have been updating Tartarus to include observing sequences
conducted after 1999 January. The revised database will contain products for
375 objects, with a total of 614 observing sequences. We have begun a
systematic timing analysis of the Tartarus light curves. We present here some
preliminary results of an investigation into the relation between excess
variance and black-hole mass. Having optimised our analysis to minimize the
scatter in the variance measurements, we find that the narrow-line active
galactic nuclei follow roughly the same relation as the broad-line objects.
