Acknowledgement

The simulation results were achieved using a range of supercomputing facilities. We acknowledge

• the PRACE (Partnership for Advanced Computing in Europe) Research Infrastructure resources Curie based at the Trs Grand Centre de Calcul (TGCC) operated by Commissariat à l’énergie atomique (CEA) near Paris, France and Marenostrum based in the Barcelona Supercomputing Center, Spain. Time on these resources was awarded by PRACE under PRACE4LOFAR grants 2012061089 and 2014102339 as well as under the Multiscale Reionization grants 2014102281 and 2015122822.

• The Swedish National Infrastructure for Computing (SNIC) at Parallel Datorcentrum (PDC), Royal Institute of Technology, Stockholm.

• The Apollo cluster at The University of Sussex