  The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere
and revealed a much more chemically complex environment than previously
believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard
Cassini provided compositional measurements of this region and found an influx
of material raining into Saturn's upper atmosphere from the rings. We present
here an in-depth analysis of the CH$_4$, H$_2$O, and NH$_3$ signal from INMS
and provide further evidence of external material entering Saturn's atmosphere
from the rings. We use a new mass spectral deconvolution algorithm to determine
the amount of each species observed in the spectrum and use these values to
determine the influx and mass deposition rate for these species.
