The results of applying Jeans Modelling to find the velocity curves from samples drawn from action distributions. We create samples of tracer particles drawn from three different models, a model representing an approximately exponential disc, and two models where the disc has been truncated, with the Trunc4 model sharply truncated. The solid lines correspond to velocity curves found using number densities that correctly match the action distribution model. The dotted lines show the results of incorrectly assuming that the truncated samples follow an exponential number density.