Superconducting gap and vortex lattice of the heavy-fermion compound CeCu2Si2

We gratefully acknowledge K. Machida and Y. Fasano for stimulating discussions. Z.S. acknowledges support from Netherlands Organisation for Scientific Research (NWO) (Grant No. 680.50.1119). A.M. and P.W. acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC, EP/I031014/1)