[1] Univ Leicester, Sch Phys & Astronomy, Univ Rd, Leicester LE1 7RH, Leics, England
[2] Univ Helsinki, Dept Phys, Gustaf Hallstromin Katu 2, Helsinki 00560, Finland
[3] Finnish Geospatial Res Inst FGI, Natl Land Survey Finland, Geodeetinrinne 2, Masala 02430, Finland
[4] Open Univ, Sch Phys Sci, Milton Keynes MK7 6AA, Bucks, England
[5] Max Planck Gesell, Semicond Lab, Otto Hahn Ring 6, D-81739 Munich, Germany
[6] PNSensor GmbH, Otto Hahn Ring 6, D-81739 Munich, Germany
[7] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany
[8] Finnish Museum Nat Hist, Pohjoinen Rautatiekatu 13, Helsinki, Finland
[9] Dept Geosci & Geog, Gustaf Hallstromin Katu 2, Helsinki 00560, Finland
[10] Univ Manchester, Dept Earth & Environm Sci, Oxford Rd, Manchester M13 9PL, England
[11] Inst Nacl Tecn Aeroesp, Ctra Torrejon Ajalvir, km 4, Madrid 28850, Spain
[12] Photonis France SAS, Ave Roger Roncier, F-19100 Brive, France
[13] Curtin Univ, Fac Sci & Engn, Perth, WA 6102, Australia
[14] Birkbeck Coll Univ London, Dept Earth & Planetary Sci, London, England
[15] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany
[16] Imperial Coll London, Blackett Lab, London, England
[17] Finnish Meteorol Inst, Erik Palmenin Aukio 1, Helsinki 00560, Finland
[18] Aberystwyth Univ, Aberystwyth, Dyfed, Wales
[19] Aalto Univ, Sch Elect Engn, Espoo 02150, Finland
[20] Inst Astrofis Andalucia, Glorieta Astron S-N, Granada 18008, Spain
[21] CSIC INTA, Ctr Astrobiol, Ctra Torrejon Ajalvir,Km 4, Madrid 28850, Spain
[22] Inst Recherce Astrophys & Planetol, 9 Ave Colonel Roche, F-31400 Toulouse, France
[23] Oxford Instruments Technol Oy, Espoo 02150, Finland
[24] Carnegie Inst Sci, Earth & Planets Lab, 5241 Broad Branch Rd, Washington, DC 20015 USA
[25] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 2998510, Japan
[26] Harvard Univ, Dept Earth & Planetary Sci, Origins Life Initiat, Cambridge, MA 02138 USA
[27] Univ Leicester, Sch Engn, Univ Rd, Leicester LE1 7RH, Leics, England