Acknowledgements
F.B. was partially supported by NSF FRG Grant
DMS1360621 and NSF Grant DMS1801328.
T.C. was partially supported by NSF FRG Grants DMS1265290 and DMS1360767,
NSF SaTC Grants CNS1513671 and CNS1701785, Simons Foundation Grant 338379,
and NSF Grant DMS1107263/1107367/1107452 "RNMS: Geometric Structures and
Representation Varieties" (the GEAR Network).
R.G. was partially supported by NSF FRG Grant DMS1360902.
M.K. was partially supported by EPSRC First Grant EP/L021986/1.
G.P. was partially supported by NSF FRG Grants DMS1360733 and DMS1701619.

Author information
F. M. Bleher:
Department of Mathematics, University of Iowa, Iowa City, IA 52242, USA fraukebleher@uiowa.edu
T. Chinburg:
Department of Mathematics, University of Pennsylvania, Philadelphia,
PA 19104, USA
ted@math.upenn.edu
R. Greenberg:
Department of Mathematics, University of Washington, Box 354350, Seattle,
WA 98195, USA
greenber@math.washington.edu
M. Kakde:
Department of Mathematics, King's College, Strand, London WC2R 2LS, UK
mahesh.kakde@kcl.ac.uk
G. Pappas:
Department of Mathematics, Michigan State University, East Lansing,
MI 48824, USA
pappas@math.msu.edu
M. J. Taylor:
Merton College, University of Oxford, Oxford, OX1 4JD, UK
martin.taylor@merton.ox.ac.uk
