  In this paper, we investigate exact tail asymptotics for the stationary
distribution of a fluid model driven by the $M/M/c$ queue, which is a
two-dimensional queueing system with a discrete phase and a continuous level.
We extend the kernel method to study tail asymptotics of its stationary
distribution, and a total of three types of exact tail asymptotics is
identified from our study and reported in the paper.
