Beam-helicity and beam-charge asymmetries in the hard exclusive
leptoproduction of real photons from an unpolarised hydrogen target by a 27.6
GeV lepton beam are extracted from the HERMES data set of 2006-2007 using a
missing-mass event selection technique. The asymmetry amplitudes extracted from
this data set are more precise than those extracted from the earlier data set
of 1996-2005 previously analysed in the same manner by HERMES. The results from
the two data sets are compatible with each other. Results from these combined
data sets are extracted and constitute the most precise asymmetry amplitude
measurements made in the HERMES kinematic region using a missing-mass event
selection technique.
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