====== Экспериментальные данные ======

===== <instance_exptl_data> =====
  <instance_exptl_data id="exptl₁" instance="var₁">
   <data reactant="A" x_unit="1" y_unit="1" type="conc">
     0.1 0.90480, 0.4 0.67076, ...
   </data>
  </instance_exptl_data>