Description of the multi-approach gravity field models from Swarm GPS data

João De Teixeira da Encarnação, Pieter Visser, Daniel Arnold, Ales Bezdek, Eelco Doornbos, Matthias Ellmer, Junyi Guo, Jose van den IJssel, Elisabetta Iorfida, Adrian Jäggi, Jaroslav Klokocník, Sandro Krauss, Xinyuan Mao, Torsten Mayer-Gürr, Ulrich Meyer, Josef Sebera, C. K. Shum, Yu Zhang, Chaoyang Zhang, Christoph Dahle