pywws-page/_graph_templates/includes/hourly_baro_line.xml

<?xml version="1.0" encoding="utf-8"?>
  <plot>
    <source>hourly</source>
    <yrange>960, 1050</yrange>
    <grid>ytics</grid>
    <subplot>
      <colour>2</colour>
      <ycalc>data['rel_pressure']</ycalc>
      <title>Luftdruck (㍱)</title>
    </subplot>
  </plot>