A SpatialPointsDataFrame (EPSG:32717) object
with 100 randomly sampled points (stratified by altitude). For more
details, please refer to Muenchow et al. (2013).
Muenchow, J., Bräuning, A., Rodríguez, E.F. & von Wehrden, H. (2013):
Predictive mapping of species richness and plant species' distributions of a
Peruvian fog oasis along an altitudinal gradient. Biotropica 45, 5, 557-566,
doi: 10.1111/btp.12049.