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Doppler tomography is a technique that has revolutionised the interpretationof the phase-resolved spectroscopic observations of interacting binary systems.We present the results of our investigation of reversing the velocity axis tocreate an inside-out Doppler coordinate framework with the intent to exposeoverly compacted and enhance washed out emission details in the standardDoppler framework. The inside-out tomogram is constructed independently of thestandard tomogram by directly projecting phase-resolved spectra onto aninside-out velocity coordinate frame. For the inside-out framework, thezero-velocity origin is transposed to the outer circumference and the maximumvelocities to the origin of the velocity space. We test the technique on asimulated system and two real systems with easily identifiable features, namelythe accretion disc and bright spot in WZ Sge, and spiral shocks in IP Peg. Ourtests show that there is a redistribution of the relative brightness ofemission components throughout the tomograms, i.e., where the standardframework tends to concentrate and enhance lower velocity features towards theorigin, the inside-out velocity framework tends to concentrate and enhancehigher velocity features towards the origin. Conversely, the standard frameworkdisperses and smears the higher velocities farther away from the origin whereasthe inside-out framework disperses and smears the lower velocities. Inaddition, the projection of the accretion disc in velocity space now appearscorrectly orientated with the inner edge close to the maximum velocity originand its outer edge closer to the zero-velocity outer circumference.Furthermore, the gas stream and secondary star are projected on the outside ofthe disc with the bright spot of the stream-disc impact region on the disc'souter edge in the inside-out velocity space.

Exploring inside-out Doppler tomography: non-magnetic cataclysmic variables