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We examine different measures of asymmetry for galaxy HI velocity profiles.We introduce the channel-by-channel asymmetry and the velocity-of-equalitystatistics to quantify profile asymmetries. Using a sample of simulatedgalaxies, we examine how these and the standard lopsidedness morphometricstatistic depend on a variety of observational effects including the viewingangle and inclination. We find that our newly introduced channel-by-channelasymmetry is less sensitive to the effects of viewing angle and inclinationthan other morphometrics. Applying our statistics to the WHISP HI galaxysample, we also find that the channel-by-channel asymmetry, is a betterindicator of visually-classified asymmetric profiles. In addition, we find thatthe lopsidedness-velocity of equality space can be used to identify profileswith deep central dips without visual inspection.

Systematically Asymmetric: A comparison of \hi\ profile asymmetries in real and simulated galaxies