1. ASTRON‐The Netherlands Institute for Radio Astronomy Dwingeloo Netherlands
2. Electrical and Computer EngineeringUniversity of California, San Diego La Jolla California USA
3. Sodankylä Geophysical ObservatoryUniversity of Oulu Sodankylä Finland
4. STFC Rutherford Appleton LaboratoryHarwell Science and Innovation Campus Didcot UK
5. MIT Haystack Westford Massachusetts United States
6. Department of PhysicsUniversity of Oulu Oulu Finland