Same version of RSTT model as rstt201404. Uncertainty files were fixed for Pg and Lg to smooth out some points.

The crust in South America was updated with the crust from references below (Assumpcao et al.) and the upper mantle velocity and gradient were slightly updated to accommodate the change in the crust. 

Due to low velocity zone constraints, some modifications on crustal velocities were made.

References for South American Crust:
Assumpção, M., Feng, M., Tassara, A., Juliá, J., 2013a. Models of crustal thickness for South America from seismic refraction, receiver functions and surface wave tomography. Tectonophysics. http://dx.doi.org/10.1016/j.tecto.2012.11.014.

Assumpção, M., Bianchi, M.B., Julià, J., Dias, F.L., França, G.S., Nascimento, R.M., Drouet, S., Pavão, C.G., Albuquerque, D.F., Lopes, A.E.V., 2013b. Crustal thickness map of Brazil: data compilation and main features. Journal of South American Earth Sciences. http://dx.doi.org/10.1016/j.jsames.2012.12.009 (accepted 18-December-2012).