  We carry out an analysis of the evacuated mass from three coronal dimming
regions observed by the {\it Atmospheric Imaging Assembly} (AIA) on board the
{\it Solar Dynamics Observatory}. The three events are unambiguously identified
with white-light coronal mass ejections (CMEs) associated in turn with surface
activity of diverse nature: an impulsive (M-class) flare, a weak (B-class)
flare and a filament eruption without a flare. The use of three AIA coronal
passbands allows applying a differential emission measure technique to define
the dimming regions and identify their evacuated mass through the analysis of
the electronic density depletion associated to the eruptions. The temporal
evolution of the mass loss from the three dimmings can be approximated by an
exponential equation followed by a linear fit. We determine the mass of the
associated CMEs from COR2 data. The results show that the evacuated masses from
the low corona represent a considerable amount of the mass of the CMEs. We also
find that plasma is still being evacuated from the low corona at the time when
the CMEs reach the COR2 field of view. The temporal evolution of the angular
width of the CMEs, of the dimming regions in the low corona, and of the flux
registered by GOES in soft X-rays are all in close relation with the behavior
of mass evacuation from the low corona. We discuss the implications of our
findings toward a better understanding of the temporal evolution of several
parameters associated to the analyzed dimmings and CMEs.
