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NGC 4013 is a distinctly warped galaxy with evidence of disk-halo activity.Through deep HI observations and modeling we confirm that the HI disk is thin(central exponential scale height of with an upper limit of 4" or 280 pc), butflaring. We detect a vertical gradient in rotation velocity (lag), whichshallows radially from a value of -35 +7/-28 km/s/kpc at 1.4' (5.8 kpc), to avalue of zero near R_25 (11.2 kpc). Over much of this radial range, the lag isrelatively steep. Both the steepness and the radial shallowing are consistentwith recent determinations for a number of edge-ons, which have been difficultto explain. We briefly consider the lag measured in NGC 4013 in the context ofthis larger sample and theoretical models, further illuminating disk-haloflows.

The HI Kinematics of NGC 4013: a Steep and Radially Shallowing Extra-planar Rotational Lag