Lens models under the microscope: Comparison of Hubble Frontier Field cluster magnification maps

We are grateful to all those who contributed to the data used here: Anahita Alavi, Marusa Bradac, Gabe Brammer, Benjamin Clement, Jose Diego, Claudio Grillo, Austin Hoag, Jens Hjorth, Mathilde Jauzac, Traci Johnson, RyotaKawamata, Jean-Paul-Kneib, Daniel Lam, Priya Natarajan, Masamune Oguri Johan Richard, Kevin Sebesta, Jonatan Selsing, Irene Sendra, Keren Sharon, Brian Siana, Tomasso Treu, Xin Wang and Adi Zitrin. We would like to thank Minnesota Supercomputing Institute whose technical support and computer resources were invaluable in producing the GRALE set of models. Financial support for this work was provided to SAR by NASA through grant HST-GO-13386 from the Space Telescope Science Institute (STScI), which is operated by Associated Universities for Research in Astronomy, Inc. (AURA), under NASA contract NAS 5-26555. The background HFF images of Abell 2744 and MACS J0416 in Fig. 4 were taken from https://www.spacetelescope.org/images/heic1111c and https://frontierfields.org/meet-the-frontier-fields/, respectively. We thank the referee for the careful reading of the manuscript and suggestions that helped improve the paper.