center frame title

Hi,

this is probably an easy question, but I could not find a solution
yet:

I am using the color theme beaver like this:

\documentclass{beamer}
\mode<presentation>
{
\usecolortheme{beaver}
}

\usepackage{graphicx}
\usepackage{textcomp}

\title
{Title}
\author [Author]
{Author}
\subject{Subject}

\begin{document}


The frame titles are right adjusted, but I would prefer them to be
centered. How can I achieve this?

Best,

Georg




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