Appendix B. Six sets of graphs show fitted models of response of graminoids, deciduous shrubs, forbs and horsetails, lichens, bryophytes, and evergreen shrubs to three initial levels of winter vehicle disturbance in five tundra vegetation types in arctic Alaska. Differences are percent cover in disturbed plot minus percent cover in adjacent reference plot. The short-dashed line is the 95% credibility envelope of the fitted model for the highest level of initial disturbance. The variance components are θt(temporal), θs(spatial), and θn(nugget).