Provide a brief consolidated description of the regional gas system for each risk group [2] the Member States participates in, covering:
Cuir tuairisc chomhdhlúite ghairid ar fáil ar na córais gáis réigiúnacha do gach grúpa [2] ina bhfuil an Ballstát rannpháirteach, lena gcumhdaítear an méid a leanas: