  We study the family of quadratic maps f_a(x) = 1 - ax^2 on the interval
[-1,1] with a between 0 and 2. When small holes are introduced into the system,
we prove the existence of an absolutely continuous conditionally invariant
measure using the method of Markov extensions. The measure has a density which
is bounded away from zero and is analogous to the density for the corresponding
closed system. These results establish the exponential escape rate of Lebesgue
measure from the system, despite the contraction in a neighborhood of the
critical point of the map. We also prove convergence of the conditionally
invariant measure to the SRB measure for f_a as the size of the hole goes to
zero.
