Example cw observations of (85990) 1999 JV6, collected in January 2015 at Arecibo (detailed description of the radar power spectra is in Table A.1). The signal is recorded in two channels, with the same circular (SC) polarisation as the transmitted radiation marked with a dashed line in each panel, and the opposite circular (OC) polarisation, marked with a solid line. The spectra show a SC/OC ratio typical for a NEA, which suggests the presence of some surface features at a scale comparable to the radar wavelength (13 cm for Arecibo).