Doppler tomography of intermediate polar spin cycles

I collect emission-line profiles for seven intermediate polars, phase-resol ved over the spin cycles. I then present the first systematic application o f Doppler tomography to the spin cycles, with the aim of investigating whet her spin-cycle tomography is a useful diagnostic tool. Four stars show line emission from material falling onto both magnetic poles of the white dwarf , but three others show line emission from only the upper pole. Tomography can map the extent and shape of the line-emitting accretion curtains, but i t can also give misleading results if the line flux changes significantly o ver the spin cycle.