Complexity of localised coherent structures in a boundary-layer flow Taras Khapko, Yohann Duguet, Tobias Kreilos, Philipp Schlatter, Bruno Eckhardt and Dan S. Henningson Eur. Phys. J. E, 37 4 (2014) 32 Published online: 28 April 2014 DOI: 10.1140/epje/i2014-14032-3