Guides Papers Meetings (presentations etc) M6 Stakeholder Catch-Up WP1 Next generation carbon dioxide isotope ratio gas reference materials by Harro Meijer, RUG WP2 First time isotope ratio gas reference materials for δ13CH4 and δ2H-CH4 by Stefan Persijn, VSL WP3 Advancing optical isotope ratio spectroscopy for carbon dioxide and methane by Jelka Braden-Behrens, PTB WP4 Creating Impact by Garry Hensey, NPL Posters 19ENV05 STELLAR – Project Introduction Summary M1 Publishable Summary for 19ENV05 STELLAR Stable isotope metrology to enable climate action and regulation