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{\large\bf\boldmath A study  of event shape variables in deep-inelastic $ep$ 
scattering at HERA.
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{H1 Collaboration}\\                            
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{\small \em DESY, Hamburg, Germany}\\[6mm]
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Deep-inelastic $ep$ scattering data, taken with the H1 detector at HERA,
are used to study in the Breit-frame the event shape variables thrust, jet
broadening,
jet mass, $C$~parameter and two kinds of differential two-jet rates
over a large range of four-momentum transfer $Q$ between
$7\,{\rm GeV}$ and $100\,{\rm GeV}$. \\
Second order calculations of perturbative QCD are fitted to
the $Q$ dependence of the mean values, applying power law 
corrections proportional to $1/Q^p$
to account for hadronization effects. The concept of these power corrections
is tested by a systematic investigation in terms of a non-perturbative
parameter $\overline{\alpha}_{p-1}$ and the strong coupling constant.

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