  Our knowledge of the properties of Coronal Mass Ejections (CMEs) in the inner
heliosphere is constrained by the relative lack of plasma observations between
Sun and 1 AU. In this work, we present a comprehensive catalog of 47 CMEs
measured in situ measurements by two or more radially aligned spacecraft
(MESSENGER, Venus Express, STEREO or Wind/ACE). We estimate the CME impact
speeds at Mercury and Venus using a drag-based model and present an average
propagation profile of CMEs (speed and deceleration/acceleration) in the inner
heliosphere. We find that CME deceleration continues past Mercury's orbit but
most of the deceleration occurs between the Sun and Mercury. We examine the
exponential decrease of the maximum magnetic field strength in the CME with
heliocentric distance using two approaches: a modified statistical method and
analysis from individual conjunction events. Findings from both the approaches
are on average consistent with previous studies but show significant
event-to-event variability. We also find the expansion of the CME sheath to be
well fit by a linear function. However, we observe the average sheath duration
and its increase to be fairly independent of the initial CME speed,
contradicting commonly held knowledge that slower CMEs drive larger sheaths. We
also present an analysis of the 3 November 2011 CME observed in longitudinal
conjunction between MESSENGER, Venus Express, and STEREO-B focusing on the
expansion of the CME and its correlation with the exponential fall-off of the
maximum magnetic field strength in the ejecta.
