t'>'measurement1'</span>, <span class='st'>'measurement2'</span> <span class='op'>|</span>
    <span class='fl'>1</span>   , <span class='st'>'a'</span>           , <span class='fl'>10</span>             <span class='op'>|</span>
    <span class='fl'>2</span>   , <span class='st'>'b'</span>           , <span class='fl'>20</span>             <span class='op'>)</span>
<span class='fu'>gather_se</span><span class='op'>(</span><span class='va'>d</span>,
  key <span class='op'>=</span> <span class='st'>"value_ca