HH 81 in [S II] showing proper motions as vectors superimposed on the 2018 image. The vector lengths correspond to the motion over a 23 yr interval. An interactive version of this figure is available. Clicking on the image will switch between the 1995 and 2018 images to show the changes and motions over the 23 yr span.

An interactive version of this figure is available in the online journal.