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A fully-sampled and hitherto highest resolution and sensitivity observationof neutral hydrogen (HI) in the Leo Triplet (NGC 3628, M 65/NGC 3623, and M66/NGC 3627) reveals six HI structures beyond the three galaxies. We presentdetailed results of the morphologies and kinematics of these structures, whichcan be used for future simulations. In particular, we detect a two-armstructure in the plume of NGC 3628 for the first time, which can be explainedby a tidal interaction model. The optical counterpart of the plume is mainlyassociated with the southern arm. The connecting part (base) of the plume(directed eastwards) with NGC 3628 is located at the blueshifted (western) sideof NGC 3628. Two bases appear to be associated with the two arms of the plume.A clump with reversed velocity gradient (relative to the velocity gradient of M66) and a newly detected tail, i.e. M 66SE, is found in the southeast of M 66.We suspect that M 66SE represents gas from NGC 3628 which was captured by M 66in the recent interaction between the two galaxies. Meanwhile gas is fallingtoward M 66, resulting in features already previously observed in thesoutheastern part of M 66, e.g. large line widths and double peaks. Anupside-down `Y'-shaped HI gas component (M 65S) is detected in the south of M65 which suggests that M 65 may also have been involved in the interaction. Westrongly encourage modern hydrodynamical simulations of this interacting groupof galaxies to reveal the origin of the gaseous debris surrounding all threegalaxies.

HI mapping of the Leo Triplet: Morphologies and kinematics of tails and bridges