1. Schlumberger Fiber-Optic Technology Center, Unit 7; The Quadrangle, Premier Way Romsey SO51 9DL UK
2. MINES ParisTech, PSL Research University; Centre de Géosciences; 35 rue Saint-Honoré 77300 Fontainebleau France
3. Reece Innovation, Armstrong Works; Scotswood Road Newcastle upon Tyne NE15 6UX UK