Two y‐z views at intermediate times that provide a good perspective on the origin of the bridge particles in the best and alternate Hydra models. Gas particles from galaxy B are shown as dots, while the gas distribution of galaxy A is shown by a few representative column density contours. The bridge in the alternate model is made up of four components (labeled i–iv in the top right‐hand panel). Components ii and iv are the dense streams that make up the outer edges of the broad bridge from B to A. In the best model the projected B‐A bridge is much narrower, although of comparable mass. Component iii is the tidal bridge from A, visible in the contours at the earlier time. Component i includes the top and end portions of the B tail that happen to be projected onto the bridge in the x‐y view. See Fig. 15 and text for more details.