Reply to the Comment by D. Spemann et al. M. Sepioni, R. R. Nair, I.-Ling Tsai, A. K. Geim and I. V. Grigorieva EPL, 98 5 (2012) 57007 Published online: 08 June 2012 DOI: 10.1209/0295-5075/98/57007