Physical measurement : Quantity of natural gas measured in energy that has transited through the network at one point.
GCV : Gross calorific value of the natural gas transited.
WOBBE : Wobbe Index of the natural gas transited.
CH4 : Methane content of the natural gas transited.
H2 : Hydrogen content of the natural gas transited.
O2 : Oxygen content of the natural gas transited.