Rights:
© 2006 IOP Publishing. This is the accepted version of the following article: Gosálvez, M. A. & Cheng, D. & Nieminen, Risto M. & Sato, K. 2006. Apparent activation energy during surface evolution by step formation and flow. New Journal of Physics. Volume 8, Issue 11. 269/1-11. ISSN 1367-2630 (printed). DOI: 10.1088/1367-2630/8/11/269, which has been published in final form at http://iopscience.iop.org/article/10.1088/1367-2630/8/11/269/meta.