Photometric SED of AU Mic (coloured dots) covers 0.13 µm to 670 µm. The photospheric emission of a 3600 K dwarf with solar metallicity is shown by the blue line (BT-Settl model; Allard et al. 2012). AU Mic shows significant flux excesses at wavelengths shorter than 0.3 µm and longer than 40 µm, which are compatible with stellar activity and the presence of a circumstellar debris disc (Kalas et al. 2004), respectively. Horizontal error bars account for the width of the filter passbands. Effective wavelengths and widths of the passbands are taken from the Virtual Observatory filter database (Bayo et al. 2008).