<chr_abbr type="frq" class="ss" expan="et" cert="yes">et2</chr_abbr> <chr_abbr type="reg" class="ss" expan="com" cert="no">com</chr_abbr><chr_abbr type="reg" class="dc" expan="" cert="no">m-hbar</chr_abbr>t <chr_var letter="s" var="long">∫</chr_var>e<chr_var letter="s" var="long">∫</chr_var> il <chr_abbr type="reg" class="ss" expan="com" cert="no">com</chr_abbr>tenu<chr_var letter="s" var="long">∫</chr_var> 